Answer :
To find the absolute pressure, we add the atmospheric pressure to the given gauge pressure. The gauge pressure is the pressure in the system above the atmospheric pressure. The formula is:
$$
P_{\text{abs}} = P_{\text{gauge}} + P_{\text{atm}}
$$
Here, the gauge pressure is given as $156\,\text{kPa}$ and the atmospheric pressure is approximately $100\,\text{kPa}$. Substituting these values, we have:
$$
P_{\text{abs}} = 156\,\text{kPa} + 100\,\text{kPa} = 256\,\text{kPa}
$$
Therefore, the correct answer is:
D. $256\,\text{kPa}$
$$
P_{\text{abs}} = P_{\text{gauge}} + P_{\text{atm}}
$$
Here, the gauge pressure is given as $156\,\text{kPa}$ and the atmospheric pressure is approximately $100\,\text{kPa}$. Substituting these values, we have:
$$
P_{\text{abs}} = 156\,\text{kPa} + 100\,\text{kPa} = 256\,\text{kPa}
$$
Therefore, the correct answer is:
D. $256\,\text{kPa}$
