Definition= u tube manometer is a simplest scintefic instrument to measure gas pressure.
construction=This type of manometer consiss of a U shaped tube in which the manometric liquid is filled. The manometer is used to measure the pressure which is unknown by the balancing gravity force and acceleration due to gravity
The manometer consists steel,brass.alumunium material and the tubes are made by glass.The markings are in milimeter or may be sometimes in kilo pascle
working= The unknown pressure is applied in the one arm of the tube an the mercury in the tube or manometric liquid filled in the tube moves in the tube or rises to the constant region then the movement is stopped. The hight of the liquid is measured and noted . The pressure is calculated by using the formula
Advantages=(1) Simple in construction. (2) Low cost. (3) Very accurate and sensitive
Disadvantages=(1)Error can happen while measuring the hight (2)Construction is fragile