How do I solve this problem

Question

If the mercury in a nanometer raises 18.5 mL due to the change in pressure What is the corresponding change in pressure in atm

Answer 1

Atmospheric pressure is measured by the height a mercury column rises from the surface of mercury at the bottom of the manometer (I assumed you meant manometer rather than nanometer). The height the mercury rises is independent of the diameter of the manometer tube. So, giving the volume only cannot be used to determine the increase in atmospheric pressure unless the internal diameter of the manometer tube is 1.0 cm². In this case the height the mercury rises in cm would be the increase in atmospheric pressure in cm of mercury. To determine the increase in pressure in this case, you would solve the equation V = h x A, where V is the volume (18.5 mL), h is the height in cm, and A is the internal area of the tube (assumed to be 1.0 cm². The value for h would then be 18.5 cm of mercury.