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Question 1.5: Absolute Pressure of a Vacuum Chamber A vacuum gage connecte...

Absolute Pressure of a Vacuum Chamber

A vacuum gage connected to a chamber reads 5.8 psi at a location where the atmospheric pressure is 14.5 psi. Determine the absolute pressure in the chamber.

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The gage pressure of a vacuum chamber is given. The absolute pressure in the chamber is to be determined.

 

Analysis The absolute pressure is easily determined from Eq. 1-16 to be

 

P_{\text{abs}} = P_{\text{am}} – P_{\text{vac}} = 14.5 – 5.8 = 8.7 psi

 

Discussion Note that the local value of the atmospheric pressure is used when determining the absolute pressure.

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