Question

If a system is maintained at a pressure of 2 psi of vacuum, what is the pressure in psia (lbs per square inch absolute)

Answer 1

The absolute pressure of the system is 12.7 psia.

Step-by-step explanation:

Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:

`p_(abs) = p_(atm) - p_(vac)`

Where:

`p_(abs)` - Absolute pressure, measured in pounds per square inch.

`p_(atm)` - Atmospheric pressure, measured in pounds per square inch.

`p_(vac)` - Vacuum pressure, measured in pounds per square inch.

Given that
`p_(atm) = 14.7\,psia` and
`p_(vac) = 2\,psia`, the absolute pressure of the system is:

`p_(abs) = 14.7\,psia-2\,psia`

`p_(abs) = 12.7\,psia`

The absolute pressure of the system is 12.7 psia.