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

Given:

$p_{\rm atm}=101.325\:\rm MPa$

$p_{g1}=25\:\rm psi=0.17\: MPa$

$p_{g2}=235\:\rm torr=0.03\: MPa$

The absolute pressure

$$p_a=p_{\rm atm}+p_g$$

1.

$$p_{a1}=p_{\rm atm}+p_{g1}\\=101.325\:\rm MPa+0.17\: MPa=101.495\: MPa$$

2.

$$p_{a2}=p_{\rm atm}+p_{g2}\\=101.325\:\rm MPa+0.03\: MPa=101.355\: MPa$$