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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 {vac }}=P_{\text {atm }}-P_{\text {abs }}                 (1–16)

P_{ abs }=P_{ atm }-P_{ 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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