Question

2. obtain the absolute pressure of the gas when the gas pressure in the container is...

2. obtain the absolute pressure of the gas when the gas pressure in the container is a vacuum diagram indicating a pressure of 47.2% against atmospheric pressure. However, the atmospheric pressure shall be 758.4 mmHg. Next, what is the absolute pressure if the pressure was 322.4 mmHg by injecting gas into the container?

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Answer #1

vaccum gauge shows the pressure less than or relative to the atmospheric pressures.

vaccum pressure = atmosheric pressure - absolute pressure

0.472 x 758.4 = 758.4 - absolute pressure

absolute pressure = 758.4 x (1-0.472) = 400.4352 mmHg

when the gas is injected, the pressure shown by vaccum gauge =  322.4 mmHg

absolute pressure = 758.4 - 322.4 = 436 mmHg.

assumption :

the pressure indicated by the vaccum diagram is taken as relative difference between atmospheric and the absolute pressure of the inside gas.

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