Question

Given the atmospheric pressure to be 101.325 MPa, find the absolute pressure if the gauge pressure is:

1.1 Pg = 25 psi

1.2 Pg = 235 torr

Answer 1

$P_{atm}= 101325\ Pa$

(a)

$P_g= 25psi = 172369Pa\\ P = P_g + P_{atm} = 172369Pa + 101325Pa=273694 Pa$

(b)

$P_g= 235\textsf{ torr} = 31331 Pa\\ P = P_g + P_{atm} = 31331Pa + 101325Pa=132656 Pa$