(a) The pressure in the room in atmospheres (atm) : 1 atm
Atmospheric pressure, also called atmospheric pressure, the force per unit area exerted by an atmospheric column (ie, the total mass of air over a given area). Atmospheric pressure can be measured with a mercury barometer (hence the common synonym barometric pressure), which indicates the height of a mercury column that exactly balances the weight of the air column relative to the barometer. Air pressure is also measured with an aneroid barometer
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