What is the difference between absolute and gage pressure?

Answers

Answer 1

Explanation:

Step1

Absolute pressure is the pressure above zero level of the pressure. Absolute pressure is considering atmospheric pressure in it. Absolute pressure is always positive. There is no negative absolute pressure.

The expression for absolute pressure is given as follows:

[tex]P_{ab}=P_{g}+P_{atm}[/tex]

Here, [tex]P_{ab}[/tex] is absolute pressure, [tex]P_{g}[/tex] is gauge pressure and[tex]P_{atm}[/tex] is atmospheric pressure.

Step2

Gauge pressure is the pressure that measure above atmospheric pressure. It is not considering atmospheric pressure. It can be negative called vacuum or negative gauge pressure. Gauge pressure used to simplify the pressure equation for fluid analysis.

Related Questions

A 2-kg plastic tank that has a volume of 0.2m^3 is filled with water. Assuming the density of water is 999 kg/m 3 ; determine the weight of the combined system.

Answers

Answer:

Mass of the combined system = 201.8 Kg

Weight of the combined system = 1977.64 N

Explanation:

Given:

Mass of the plastic tank = 2 kg

Volume of the plastic tank = 0.2 m³

Density of water = 999 Kg/m³

Now, the volume of water in the tank = volume of tank = 0.2 m³

Also,

Mass = Density × Volume

therefore,

Mass of water = 999 × 0.2 = 199.8 Kg

Thus, the combined mass = Mass of tank + Mass of water in the tank

the combined mass = 2 + 199.8 = 201.8 Kg

Also,

Weight = Mass × Acceleration due to gravity

Weight = 201.8 × 9.8 = 1977.64 N

Explain in less than 100 words, how you can obtain the young's modulus of a material using a tensile machine.

Answers

Answer with Explanation:

In a tensile test in an tensile machine the following steps followed to obtain the young's modulus:

1) A specimen of material with known cross sectional area and gauge length is loaded axially.

2) The load is increased and the corresponding change in the gauge length of the material is noted by using a deflectometer or a dial gauge.

3) The ratio between Force applied and the nominal cross section known as stress is calculated for each applied value of force until the material fails.

4) The ratio between the change in gauge length and the original gauge length is found this ratio is known as strain.

5) A graph is plotted between the values calculated in step 3 and 4 above.

6) The slope of the line at the origin of the graph gives the young's modulus of the material.

Use Newton's law of universal gravitation to calculate the weight of a 90 kg person standing on the surface of the earth to the nearest 1 N.

Answers

Final answer:

To find the weight of a 90 kg person on Earth, use the formula w = mg, where g is 9.80 m/s², resulting in a weight of 882 N to the nearest 1 N.

Explanation:

To calculate the weight of a person on Earth using Newton's law of universal gravitation, you use the formula:

w = mg

Where w is the weight in newtons (N), m is the mass in kilograms (kg), and g is the acceleration due to gravity on Earth, which is 9.80 m/s².

Given a person has a mass of 90 kg, their weight can be calculated as follows:

w = (90 kg) × (9.80 m/s²) = 882 N

Therefore, the weight of a 90 kg person standing on the surface of the Earth is 882 N to the nearest 1 N.

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