Definition: The atmospheric pressure at any position is numerically same to the weight of a column of air of unit cross-sectional area extending from that position to the top of the atmosphere.

MEASUREMENT OF ATMOSPHERIC PRESSURE

(ii) Water Barometer: Let us consider water is needed in the barometer instead of mercury.

The height of the water column in the tube will be 10 3 m. Such a big tube cannot be occupied easily, water barometer is not feasible.

(i) Liquid goes in elevator: When elevator accelerates upward with acceleration  then pressure in the fluid, at depth 'h' may be given by,

  p₁-p₂=lpa where p₁ and p₂ are pressures at point 1 & 2.

            Then    h₁ - h₂ = la_o/g

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