Calculate the absolute pressure if a barometer is - 40 mmHg of gauge pressure.

Answer 1

To calculate the absolute pressure, we need to add the atmospheric pressure to the gauge pressure.

Given that the gauge pressure is -40 mmHg, we can assume that the atmospheric pressure is 760 mmHg (standard atmospheric pressure at sea level).

So, the absolute pressure would be:

Absolute Pressure = Gauge Pressure + Atmospheric Pressure
= -40 mmHg + 760 mmHg
= 720 mmHg.

Therefore, the absolute pressure is 720 mmHg.