40 litres of air at 20°C is filled in a balloon. The balloon moves
up and the
air expands. The volume of air is increased to 60 litres at about 4000 ft above
sea level. Calculate the temperature of air at this altitude.
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The atmospheric pressure is the weight exerted by the overhead atmosphere on a unit area of surface. It can be measured with a mercury barometer, consisting of a long glass tube full of mercury inverted over a pool of mercury:
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