Question

A compressed air tank has a volume of 0.81 ft^{3}. The
temperature is 70 °F and the atmospheric pressure is 14.7 psia.
When the tank is filled with air at a pressure of 46 psig,
determine the density of the air and the weight of air in the
tank.

Answer in lb

Answer #1

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A rigid tank contains 20lbm of air at 80ºF and 35
psig. Heat is added until the pressure doubles to 70 psig.
Rair = 0.3704 psia-ft3/lbm-R
Draw the P-v and T-v diagrams for the problem.
What is the volume of the tank ft3?
What is final temperature of the air in ºF?
How much heat is transferred in the process in Btu?

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use steam tables---
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If the atmospheric pressure in a tank is 23 atmospheres at an
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Please show steps and pictures!

1. A tank of air contains 100 ft^3. The pressure and temperature
are 1000 F and 100 psia. The air
is cooled to 100 F.
a. Find the mass of the air
b. Find the initial energy of the tank (Btu)
c. Find the final energy of the tank (Btu)
d. Compute the heat (Btu)
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Oxygen therapy uses various devices to provide oxygen to
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filled to a pressure of 2100.0 psig at a temperature of -30.0°F.
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