Explain that how does an open ended tube manometer measure pressure.

1.	Explain that how does an open ended tube manometer measure pressure.
Answer» Solution :An open tube MANOMETER is a simple device. By this device PRESSURE of gas contained in closed container can be measured. It cosists of a U- tube containing a suitable liquid. ONE end of the tube is open to the atmosphere and other end is connected to the SYSTEM whose pressure we WANT to measure. Consider pressure at point A is P. The pressure P at A is equalto pressure at point B. `P=P_(B)thereforeP=P_(A)=P_(B)P_(a)+hrhog` hence `P=P_(a)+hrhog` ...(2) where `P_(a)` is atmospheric pressure. h= Height of mercury column from B. `rho` = Density of liquid.

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