At sea level, atmospheric pressure is 101 kPa. This pressure is equivalent to a

Question

At sea level, atmospheric pressure is 101 kPa. This pressure is equivalent to a weight distributed over a surface area of one square meter. The weight causing this pressure is: (only one choice)
the weight of a one square meter column of air that is 0.76 m high.
the weight of a one square meter column of air from sea level to the top of the atmosphere.
the weight of a cubic meter of air.
the weight of a cubic meter of water.
the weight of a one square meter column of mercury that is 0.76 m high.

Explanation / Answer

since 1 atmosphere itself means that the pressure due to air
therefore the weight of one square meter of air from sea level to the top of the atmosphere is correct
hence option a) is correct

then if we calculate pressure due ti 0.76 meter mercury column
=gh=13600*9.81*0.76 = 101 kpa

there fore option b is also correct

these answers are checked from key and are correct

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