when objects are heated they tend to expand because

Answers

Answer 1

Hello!
===
When objects are heated, their molecules tend to vibrate fast. As they vibrate, the space between each atom increases. This keeps on happening, and the object expands until it has cooled down.
===
Hope this helps! :)

Related Questions

The james webb space telescope is designed primarily to observe __________.

Answers

The James Webb Space Telescope is designed primarily to observe the infrared light from dim and very distant objects. Heat from huge distance can only be detected of telescope has to be kept very cold. That's why James Webb Space Telescope is kept very cold. In order to protect the telescope from external sources of heat and light, like the Sun, Moon, and Earth itself, as well as from heat emitted by the observatory itself, James Webb Space Telescope has a 5-layer, tennis court-sized sun-shield that acts like a parasol providing shade.

The correct answer is: infrared light.

(The James Webb Space Telescope is designed primarily to observe infrared light.)
-i

Final answer:

The James Webb Space Telescope is primarily designed to observe infrared radiation, allowing astronomers to view distant galaxies and the earliest stars after the Big Bang. It's equipped with a 6.5-meter diameter mirror and is currently in a stable orbit point around 1.5 million kilometers from Earth.

Explanation:

The James Webb Space Telescope (JWST) is designed primarily to observe infrared radiation from the cosmos. This incredible space telescope was launched in December 2021 and is equipped with a mirror measuring 6.5 meters (21 feet) in diameter, composed of 36 small hexagons, similar to the Keck telescopes. It's named after James Webb, an early NASA administrator.

This telescope will allow scientists to peer farther out in space and back in time than ever before since it's designed to detect far-infrared and millimeter-wave radiation from distant galaxies, whose light has been shifted to long wavelengths because of the vast distances it hastraveledd to reach us. One of the major goals of the JWST is to observe the light of the first galaxies and stars that came into existence after the Big Bang, approximately half a billion years later.

Observing these wavelengths is crucial as it allows us to gather data that are hidden from visibility due to dust clouds surrounding these galaxies. The JWST is expected to expand our understanding of the universe by providing an unrivaled view of the cosmos.

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Compare the functions of nervous signal transmission and endocrine transmissions-

Answers

Image result for nervous signal transmissionchem.libretexts.org
The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. The membrane of an unstimulated neuron is polarized—that is, there is a difference in electrical charge between the outside and inside of the membrane.

and

The nervous system can respond quickly to stimuli, through the use of action potentials and neurotransmitters. Responses to nervous system stimulation are typically quick but short lived. The endocrine system responds to stimulation by secreting hormones into the circulatory system that travel to the target tissue.

7.

Which is the best example of a hypothesis?
Water changes into steam if it is boiled.
If water is boiled, it will turn into steam.
If the temperature of water is increased, then it will change into steam.
When the temperature of water is increased, it changes into steam.

Answers

C. If the temperature of water is increased, then it will change into steam is stating a hypothesis.

Answer:

C. If the temperature of water is increased, then it will change into steam is stating a hypothesis.

Explanation:

8. A 300g mass hangs at the end of a string. A second-string hang from the bottom of that mass and supports a 900g mass. (a) Find the tension in each string when the masses are accelerating upward at 0.700m/s2 . (b) Find the tension in each string when the masses are accelerating downward at 0.700m/s2 .

Answers

We are looking for:
Tension A=?
Tension B=?
Then convert grams to kilograms
1kg = 1000g
300g= 0.3 kg
900g= 0.9kg
Given:
mA= 0.3kg
mB= 0.9kg
how? W=mg
g= 9.8 m/s^2
ay= 0.700m/s^2
WA= 2.94N

WB= 8.82N
For A [Tension A-Weight A - Tension B=mAay]
TA - 2.94 - TB=0.3kg(0.700m/s^2)
TA - 2.94 - TB = 0.21 N
TA - TB = 0.21N + 2.94 N
TA - TB = 3.15 N
* refer TB from below*
TA - TB = 3.15N
TA - 9.45N = 3.15N
TA = 3.15N + 9.45N
TA = 12.6N

For B F = ma
Summation of forces along y-axis = mBay
-8.82 N + TB = 0.9 kg(0.700 m/s^2)
-8.82N + TB = 0.63 N
TB = 0.63 N + 8.82 N
TB = 9.45 N

What causes the mechanical advantage of the inclined plane to be less than that of the lever? 30 points !!!

Answers

Moving an object up an inclined plane requires lessforce than lifting it straight up, at a cost of an increase in the distance moved. The mechanical advantageof an inclined plane, the factor by which the force is reduced, is equal to the ratio of the length of the sloped surface to the height it spans.

Levers often have a greater mechanical advantage than inclined planes because they can amplify force more efficiently over shorter distances. Inclined planes reduce the force needed by increasing the distance, but the work done remains the same; friction can additionally reduce the inclined plane's efficiency.

When comparing the mechanical advantage (MA) of simple machines such as the lever and the inclined plane, the reason that the lever often has a greater efficiency than the inclined plane has to do with the amount of work done and the distance over which the force is applied.

An inclined plane increases the distance over which the force must be applied to move an object to the same height, thus reducing the input force needed. However, because that distance is increased, the force must be applied over a longer path, which may result in similar amounts of work being done as lifting the object straight up. The MA of an inclined plane can be calculated using the formula MA=1/sin θ.

The lever, on the other hand, operates based on the distances from the fulcrum to the points of application of the effort and load forces. The ratio of these distances determines the MA. With levers, it is possible to gain a significant MA even over a short distance, allowing more efficient force amplification, usually without the same extent of motion required by an inclined plane.

Furthermore, when comparing the two machines, friction may play a minor role. As the inclined plane involves a greater travel distance, the opportunity for friction to affect the work done is increased, potentially reducing the system's efficiency compared to a lever where the interaction points may be more limited and thus less susceptible to energy loss due to friction.

If this atom has a balanced charged, how many protons would you expect to find in this atom?

A) 4

B) 0

C) 6

D) 2

Answers

Balanced charge means an equal number of protons as neutrons.
There are 6 - electrons so there would be 6 + protons.
Answer is C.

If this atom has a balanced charged, 6 protons will be expected to be present in the atom.

WHAT IS A BALANCED CHARGE?

A balanced charge in an atom refers to an even or same amount of the positive and negative subatomic particles in the atom.

This further means that the number of protons (+) and electrons (-) in the atom will be equal for there to be a balanced charge.

Based on the image provided in this question, there are 6 electrons (-) in the atom, hence, 6 protons must be present to have a balanced charge in the atom.

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A small 21 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

answer =
units =

Answers

Hey there! :D

Kinetic Energy= 0.5*m*v^2

m= mass

v= speed

KE= 0.5*21*4^2

KE= 168

You use joules as the units.

So, 168 joules.

I hope this helps!
~kaikers

As per this question the mass of canoe is given as 21 kg.

The canoe is floating downriver with a speed of 4 m/s.

We are asked to calculate the kinetic energy of the canoe.

The kinetic energy is the energy due to the motion of the body.

If a body has mass m and it moves with a velocity v ,then its kinetic energy is defined as

[tex]kinetic\ energy [K.E]=\frac{1}{2} mv^{2}[/tex]

we are given v= 4 m/s and m= 21 kg

Hence kinetic energy of canoe [tex]K.E= \frac{1}{2} *21 kg [4 m/s]^{2}[/tex]

=168 Joule.

Hence the kinetic energy of the particle is 168 Joule.

Here Joule is the unit of energy

A sound wave is moving with a frequency of 700 Hz. What is the period of this sound wave?

700 s
1/700 s
1/700 Hz
70 s

Answers

The period T of a wave is the reciprocal of the frequency f:
[tex]T= \frac{1}{f} [/tex]
The frequency of the wave in the problem is [tex]f=700 Hz[/tex], so the period is (keeping in mind that [tex]1 Hz=1s^{-1}[/tex])
[tex]T= \frac{1}{700 Hz}= \frac{1}{700 s^{-1} }= \frac{1}{700} s [/tex]

Answer:

1/700s

Explanation:

took test

Nineteenth century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire.

What process did Faraday discover?

A. solenoid induction
B. electromagnetic induction
C. magnetic induction
D. electric induction

Answers

Answer : Electromagnetic induction

Explanation :

In Nineteenth century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire.

He gives the relation ship between the magnetic field and the electric current to produce electromagnetic force (EMF). The EMF is given as :

[tex]\epsilon=-N\dfrac{d\phi}{dt}[/tex]

Where,

N is the number of turns

[tex]\dfrac{d\phi}{dt}[/tex] is the rate of change of magnetic flux

[tex]\phi=B.A[/tex]

B is the magnetic field

A is the area of cross section

So, the correct option is (B) "electromagnetic induction"

Nineteenth-century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire. Faraday discovers electromagnetic induction. The correct option is option (B).

Michael Faraday discovered the process of electromagnetic induction. He found that when a magnet moves through a loop of wire, an electric current is induced in the wire.

This phenomenon is the basis of electromagnetic induction, which describes the generation of an electric current or electromotive force (emf) in a conductor when it is exposed to a changing magnetic field.

Faraday's discovery of electromagnetic induction was a crucial development in the field of electromagnetism and laid the foundation for the development of electric generators, and transformers.

Therefore, Faraday discovers electromagnetic induction. The correct option is option (B).

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From a young age, we observe and learn and we incorporate into our own lifestyle the behaviors of people around us.

True

False

Answers

Hey there!

This statement is true.
From a young age, we observe and learn and we incorporate into our own lifestyle the behaviors of people around us.
This is because at a young age, people do learn from what's around them.

Hope this helps you.
Have a great day!

What is the IMA of the inclined plane shown?

What is the IMA of the lever pictured?

the sloped one is the one with the W

Answers

1. The ideal mechanical advantage (IMA) is the length of the incline divided by the vertical rise, which is called the rise up ratio. The mechanical advantage increases as the slope of the incline decreases, but then the load will have to be moved a greater distance.
IMA =L/h
= 9/1
= 9
Thus the IMA of the inclined plane is 9

2. The IMA of a lever (ignoring the internal friction) depends on the ratio of the length of the lever arm where the force is applied divided by the length of the lever arm that lifts the load.
IMA =Le/Lr
= 9/3
= 3
The IMA of the lever is therefore; 3

Answer:

Explanation:

Match each wave characteristic to its description.
TILES
frequency
wavelength
amplitude
PAIRS
the distance between adjacent crests or troughs
the number of cycles of a wave per second
the height of a wave from its equilibrium position

Answers

wavelength goes with- the distance between
amplitude- the height
frequency- the number of cycles. I just answered this on plato and got it right.

Answer :

Frequency - The number of cycles of wave per second

Wavelength - The distance between adjacent crests or troughs

Amplitude - The height of wave from its equilibrium position

Explanation :

Frequency - The number of cycles of wave per second

Formula of frequency

[tex]f=\dfrac{1}{T}[/tex]

Wavelength - The distance between adjacent crests or troughs

Formula of wavelength

[tex]f=\dfrac{c}{\lambda}[/tex]

Amplitude - The height of wave from its equilibrium position

13.

Scientists can work in which of the following. Select all that apply.
Universities
Government
Business and industry
Medical Institutes

Answers

A scientist is a person who participates and performs a systematic activity to acquire new knowledge in the field of natural sciences, that is to say, who carries out scientific research.
Science is knowledge based on observed facts and proven truths, arranged in an orderly system that can be validated and communicated to other people in the case of the natural sciences.
Business and industry: chemists, pharmacists.
Universities: For example, physicists, chemists. They work as professors and as researchers.
Medical Institutes: For example, dentists.
Answer:
Universities
Business and industry
Medical Institutes

Answer:

Universities. Government. Business and industry.

Medical Institutes. They are all CORRECT

Explanation:

I had the same question and I got it right using all 4 answers.

Ramon is playing soccer. The ball comes straight at him, and he kicks it to a player on his right. His kick is an example of

Answers

I believe your answer is d).

Hope you find this helpful! :)

Answer: d is the answer please give me vote and thanks

Explanation:

Which of the following processes requires a physical medium (a solid, liquid, or gas) to transfer thermal energy from one object to another?
I. conduction
II. convection
III. radiation
A. I and III only
B.I and II only
C. III only
D. II only
E. none of these require a physical medium to transfer thermal energy.

Answers

Choice-B ... I and II only.

Conduction and convection require a physical medium (a solid, liquid, or

gas) to transfer thermal energy from one object to another.

Conduction is the process of heat transfer that takes place in solids.

Thermal energy is usually transferred from hotter surfaces to colder ones in

order to ensure equilibrium is reached

Convection is also similar to conduction but involves heat transfer in fluids

such as water. Radiation on the other hand doesn't require a physical

medium as it exists through a vacuum. This makes option B the most

appropriate choice.

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A plane takes off in san francisco at noon and flies toward the southeast. an hour later, it is 400 kilometers east and 300 kilometers south of its starting location. assuming the plane flew in a straight line, how far did it travel? how many degrees south of east did the plane fly?

Answers

This first step involves a right triangle. If the plane is 400 km east and 300 km south of the origin, and it flew in a straight line, then you can construct a right triangle with side lengths 300, 400, and c. You may recognize that these are multiples of the Pythagorean triple 3, 4, 5, so the side length c is 500 km. Otherwise, you would write
[tex]c^2 = 300^2+400^2 \\ c = 500[/tex].

This second step is, if I am correctly interpreting "degrees south of east," to find the angle formed by the horizontal line representing the east and the path of the plane. I made a diagram that does just that (see attached). You can use a trig function of one of the angles to solve. I chose
[tex]tan(C)= \frac{3}{4} \\ arctan( \frac{3}{4})=36.870[/tex]. Thus, I believe it is 37° south of east.

An electron is released from rest and travels over a potential difference of 2500 v. what is its final velocity?

Answers

The electron travels through a potential difference of [tex]\Delta V =2500 V[/tex]. This means that the loss of electrostatic potential energy of the electron is
[tex]\Delta U = q \Delta V= (-1.6 \cdot 10^{-19}C)(2500 V)=-4 \cdot 10^{-16}J[/tex]
where q is the electron charge.

For the law of conservation of energy, the electron (starting from rest and accelerated by the potential difference) acquired a kinetic energy equal to the negative of this loss of potential energy:
[tex]\Delta K=-\Delta U[/tex]
where [tex]\Delta K =K_f - K_i = K_f[/tex] because the electron is initially at rest and so its kinetic energy is zero. Since
[tex]K_f= \frac{1}{2}mv^2 [/tex]
where m is the electron mass, we can find the final velocity v of the electron:
[tex]v= \sqrt{ \frac{2K_f}{m} }= \sqrt{ \frac{2\cdot 4 \cdot 10^{-16} J}{9.1 \cdot 10^{-31} kg} }=3.0 \cdot 10^7 m/s [/tex]

Both lead and zinc are formed as precipitates. Which of these is a step in the formation of the minerals?

elements combine at high pressure
magma cools after a volcanic eruption
atoms combine in water to form solids
materials break up due to rise in temperature

Answers

Minerals are naturally occurring inorganic (they're not formed from amino acids, peptides, or enzymes) chemical compounds.

From the given options, the following describes a step in the formation of the minerals: materials break up due to rise in temperature.

Correct answer: D

Final answer:

Lead and zinc minerals commonly form as precipitates from hot underground water cooling and depositing solid minerals. They can also form from the cooling and crystallization of magma, particularly in the presence of hydrothermal fluids.

Explanation:

Lead and zinc minerals can form through several geological processes, and one of the key methods for their formation is through the precipitation of minerals from an aqueous (water) solution. When hot underground water that has been heated by magma cools as it moves through the Earth's crust, it can deposit solid minerals. This happens because the solubility of substances often decreases as the temperature drops, leading to the formation of solids from the previously dissolved elements or compounds.

Additionally, minerals can form when magma cools after a volcanic eruption or during more gradual processes. If magma cools slowly, the minerals have time to form large, identifiable crystals. Conversely, rapid cooling leads to the formation of small crystals or even glassy textures without discernible crystals.

Hydrothermal mineral deposits are another significant source of minerals, such as lead and zinc. These deposits form when super heated water from magma chambers dissolves minerals, and as the solution cools and travels towards the surface, the dissolved minerals precipitate out, often forming rich ore bodies.

The mechanical advantage of a machine is always greater than 1. true or false

Answers

Final answer:

The statement is false; the mechanical advantage of a machine is not always greater than 1. It is the ratio of the output force to the input force and can be less than 1 in machines like third-class levers. However, machines like hydraulic systems with a wider output plunger can have a mechanical advantage greater than 1.

Explanation:

The statement that the mechanical advantage of a machine is always greater than 1 is false. The mechanical advantage (M.A.) is the number of times the input force is multiplied by a machine to achieve a greater output force. It's determined by the ratio of the output force to the input force.

In certain simple machines like levers, the mechanical advantage can indeed be less than 1. For example, in a third-class lever, where the effort arm is shorter than the load arm, the user must apply more effort than the load. This results in a mechanical advantage of less than 1. On the other hand, when discussing hydraulic systems, if the output plunger is wider than the input plunger, the mechanical advantage is greater than 1 as the output force is bigger than the input force.

The efficiency of a machine, which is the ratio of output work to input work, is always less than 100 percent due to energy losses such as friction, which converts some of the work into heat. This is a separate but related concept reflecting the loss of useful work when operating a machine.

In conclusion, while many tools and machines are designed to give us a mechanical advantage, this advantage can either be greater or less than 1, depending on the design and function of the machine.

A red filter only allows red light to pass through it. It is _________ to red light and _________ to all other types of light.
A. opaque; opaque

B. transparent; opaque

C. opaque; transparent

D. transparent; transparent

Answers

As the filter allows red light to pass through it, the filter is transparent to red light. Since red light is the only type of light that can pass through the filter, the filter is opaque to all other types of light.

Answer:
B. transparent; opaque

Final answer:

A red filter is transparent to red light as it allows it to pass, and opaque to all other light types, preventing them from passing through. The answer to the multiple choice is B. (transparent; opaque)

Explanation:

In the context of light transmission, when a filter allows light of a certain color to pass through, it is considered transparent to that light. Conversely, if the filter does not allow light of a certain color to flow through, it is opaque to that light. A red filter only allows red light to pass through it, blocking all other colors of light. Therefore, the answer to this question is B. The red filter is transparent to red light and opaque to all other types of light.

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THIS IS SIMPLE BUT I WANT A FOR SURE ANSWER :)
The ocean floor is at a lower elevation than the continents. Which of the following pieces of evidence best supports this claim?
A.Tectonic plates located below the continental crust do not move
B.Gravitational force is stronger beneath the continental crust.
C.Oceanic crust is thinner and denser than continental crust.
D.Continental crust and oceanic crust are stacked in alternating layers.

Answers

c because Oceanic Crust is denser than continental crust, and at a convergent boundary, the Oceanic crust subducts underneath the continental crust.

I Hope This Helps

Answer:

C. Oceanic plate is thinner and denser than continental plate.

Explanation:

Oceanic plate is also called SIMA because it is made up of silicon and magnesium whereas continental plate is called SIAL because it is made up of silicon and aluminium. Oceanic plate and continental plate both are less dense that mantle but oceanic plate is denser than continental plate. Oceanic plate is made up of basaltic rocks and continental plate is made up of granitic rocks.

the speed of light in a piece of plastic is 2.00x10^8 meters per second what is the absolute index of refraction of this plastic

Answers

The speed of light in a material with refractive index n is modified according to the following law:
[tex]v= \frac{c}{n} [/tex]
where c is the speed of light in vacuum ([tex]c=3\cdot 10^8 m/s[/tex]), while v is the speed of light in the medium ([tex]v=2 \cdot 10^8 m/s[/tex]). Re-arranging, we can find the refractive index of this plastic:
[tex]n= \frac{c}{v}= \frac{3 \cdot 10^8 m/s}{2 \cdot 10^8 m/s}=1.5 [/tex]

A jet fighter flying at 300 m/s (just below the speed of sound) makes a turn of radius 1.85 km. (a) what is its centripetal acceleration in gs?

Answers

centripetal acceleration can be determined using the following equation;
a = v² / r
a= centripetal acceleration
v = velocity
r = radius
substituting the values in the equation,
a = (300 m/s)*(300m/s) / (1.85 *1000) m
= 48.64 ms-²

Among the largest passenger ships currently in use, the Norway has been in service the longest. The Norway is more than 300 m long, has a mass of 6.9x10^7 kg, and can reach a top cruising speed of 9 m/s. Calculate the magnitude of the ships momentum

Answers

The magnitude of the momentum of an object is given by:
[tex]p=mv[/tex]
where m is the mass of the object, and v is its velocity.

In our problem, the mass of the ship is [tex]m=6.9 \cdot 10^7 kg[/tex] while its velocity is [tex]v=9 m/s[/tex], so the momentum of the ship is
[tex]p=mv=(6.9 \cdot 10^7 kg)(9 m/s)=6.21 \cdot 10^8 kg m/s[/tex]

Answer:

6.9x10^7

Explanation:

Which of the following types of pollution is NOT linked to coal-burning power plant emissions?
A) acid rain
B) global warming
C) ozone hole
D) smog

Answers

A is not linked. Coal burning is not an effect of acid rain.
~Deceptiøn

Final answer:

The ozone hole is not linked to coal-burning power plant emissions; while acid rain, global warming, and smog are.

Explanation:

The type of pollution that is NOT linked to coal-burning power plant emissions is the ozone hole (option C). Acid rain is linked to coal-burning because of the release of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere, which can combine with water vapor to form acid rain. Global warming is associated with coal-burning due to the emission of carbon dioxide (CO2), a major greenhouse gas. Smog is a type of air pollution that can be exacerbated by the release of various pollutants from coal-burning, including particulate matter and SO2. However, the depletion of the ozone layer, commonly referred to as the ozone hole, is primarily caused by chlorofluorocarbons (CFCs) and not emissions from coal combustion.

Which is an example of a third-class lever?
A. scissors
B. nutcracker
C. fishing pole

Answers

The correct answer is C.
:D

Final answer:

A fishing pole is an example of a third-class lever where the force applied by your hand is between the fulcrum at the end of the pole and the load being the line and hook.

Explanation:

In the world of physics, third-class levers have the application of force located between the fulcrum and the load. This type of lever is common in daily life and is found in many tools we frequently use. An excellent example of a third-class lever from the options provided in your question is a fishing pole. When you cast the line using a fishing pole, your hand provides the force in the middle of the pole (the lever), with the fulcrum at the end where the pole pivots, and the load being the line and hook that are cast out.

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When aluminum-27 is bombarded with a neutron, a gamma ray is emitted. what radioactive isotope is produced?

Answers

aluminium 28 i think thats the best isotope for this

Answer:

Go to the excited aluminum-28 isotope

Explanation:

In the processes of nuclear reactions, fundamental changes occur at the level of the atomic nucleus.

Analyze the characteristics of the neutron that has approximately the mass of the proton and has no electric charge, so when being absorbed by the aluminum core the atomic number should not be changed, but the atomic mass should increase by one unit.

The new atom formed is in an excited state and enters the base state with the emission of a high-energy radiation, gamma ray that does not transform the atom

Tthe reaction is:

⁷A₂₇ + ⁰n₁ → ⁷Al₂₈ˣ

The symbol "ˣ" means excited

⁷Al₂₈ˣ → ⁷Al₂₈ + γ

Help ASAP!

Question: Any object with mass has gravity.

Answer: Never true, sometimes true, OR always true

Answers

always true everthing has gravity

a water-balloon launcher with mass 4 kg fires a 0.5 kg balloon with a velocity of 3 m/s to the east. what is the recoil velocity of the launcher?

Answers

I think we will use the law of conservation of linear momentum;
M1V1 = M2V2
M1 = 4 kg (mass of the water balloon launcher)
V1=?
M2= 0.5 kg ( mass of the balloon)
V2 = 3 m/s

Therefore; 4 V1 = 0.5 × 3
4V1= 1.5
V1= 1.5/4
= 0.375 m/s

Meredith takes a glass of water outside on a hot summer day and leaves it there for several hours. When she returns, part of the water has evaporated and there is less water in the glass. What kind of state change did some of the water go through to make it disappear?
A. It changed from a solid to a gas.
B. It changed from a gas to a liquid.
C. It changed from a liquid to a solid.
D. It changed from a liquid to a gas.

Answers

d. it changed from a liquid to a gas.

Answer:

D. It changed from a liquid to a gas.

Explanation:

The water in the glass experiences a phenomenon called Evaporation, resulting from the heat of the atmosphere (as it is a hot summer day). The surface layer of the water in the glass will experience a change in state from liquid to gas and the layer beneath it will follow until a noticeable decrease in the water height in glass is present. This state change makes some of the water 'disappear'

Other Questions

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