Question

21) Which instrument is required to measure the liquid pressure? what is the
Principle of this apparatus?
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Answer 1

Answer:

Manometer

Explanation:

A manometer works on the principle of hydrostatic equilibrium and is used for measuring the pressure (static pressure) exerted by a still liquid or gas. Hydrostatic equilibrium states that the pressure at any point in a fluid at rest is equal, and its value is just the weight of the overlying fluid.

Answer 2

Answer

Hygrometer........