What is the absolute pressure if the gauge pressure is 48.7 kPa?

To determine the absolute pressure from the gauge pressure, it's important to understand the relationship between gauge pressure, atmospheric pressure, and absolute pressure. Absolute pressure is defined as the total pressure exerted on a system, including both the gauge pressure and atmospheric pressure.

Given that gauge pressure is 48.7 kPa, the absolute pressure can be calculated using the formula:

Absolute Pressure = Gauge Pressure + Atmospheric Pressure.

In many standard conditions, atmospheric pressure is approximately 101.3 kPa (or 100 kPa for simpler calculations). Using the commonly accepted atmospheric pressure of 100 kPa to find absolute pressure:

Absolute Pressure = 48.7 kPa + 100 kPa = 148.7 kPa.

Since the question asks for the absolute pressure, it's appropriate to round or approximate as needed, leading us to conclude that the absolute pressure is effectively in the range of 150 kPa when considering the common approximations applied in practical scenarios. This makes it clear why 150 kPa is the correct choice as it closely represents the correct calculation rounded to a commonly recognized figure.