Question

instead of pressure which pther process variables u tube manometer measure

Answer 1

well known very simple device used to measure the pressure is the U-tube manometer. The name U-tube is derived from its shape. U-tube manometer is shown below,


Construction of U-tube Manometer:


Let me explain you about the construction about the u-manometer. This manometer consists of a U shaped tube in which the manometeric liquid is filled. The manometer is used to measure the pressure which is unknown by the balancing gravity force and acceleration due to gravity, g = 9.81 m/sec2