High School

If a gas has a gauge pressure of 156 kPa, its absolute pressure is approximately:

A) 256 kPa
B) 56 kPa
C) 300 kPa
D) 100 kPa

Answer :

To determine the absolute pressure, we use the relationship between gauge pressure and atmospheric pressure. The formula is given by:

$$
P_{\text{abs}} = P_{\text{gauge}} + P_{\text{atm}}
$$

In this problem, the gauge pressure is given as $156$ kPa and the atmospheric pressure is taken to be approximately $100$ kPa. Substituting these values into the formula, we have:

$$
P_{\text{abs}} = 156\ \text{kPa} + 100\ \text{kPa} = 256\ \text{kPa}
$$

Thus, the absolute pressure is approximately $256$ kPa.

The correct answer is:

A) $256$ kPa.