What is the average value of barometric atmospheric pressure at sea level?

76 c m

of Hg

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76 c m

of water

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76 c m

of air

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24 c m

of Hg

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Solution

The correct option is A $76 c m$ of Hg
Atmospheric pressure is the pressure exerted by the earth's atmosphere at any given point, being the product of the mass of the atmospheric column of the unit area above the given point and of the gravitational acceleration at the given point.
It has a value of standard or normal atmospheric pressure, equivalent to the pressure exerted by a column of mercury $29.92 i n c h e s (760 m m)$ high, or $1013 m i l l i b a r s (101.3 k P a)$ .
At sea level the atmospheric pressure is approximately $1 k g / c m^{2}$ $(14.7$ pounds per square inch), which will cause a column of mercury in a mercury barometer to rise $760 m m$ .

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Similar questions

Q. At sea level, the atmospheric pressure is

76 c m

of Hg. If air pressure falls by

10 m m

of Hg per

120 m

of ascent, what is the height of a hill where the barometer reads

70 c m H g

At sea level, the average atmospheric pressure is equal to 76 cm of Hg.

Q. 'The atmospheric pressure at a place is

76 c m

H g

? State its value in

b a r

At sea level , the atmospheric pressure is 76 cm of Hg . If air pressure falls by 10mm of Hg per 120m of ascent, what is the hight of a hill where the barometer reads 70 cm of Hg . State the assumption made by you.

Assumption: atmospheric pressure falls linearly with ascent.

What is meant by the statement 'the atmospheric pressure at a place is 76 cm of Hg'? State its value in Pa.

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