Which is better, forward bias or reverse bias, and why ?!

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

A( developed during the process of technology design

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius