PHYS - Questions on Gas Laws
Physics, gas laws - IBDP | DSE | GCE | IAL | AP Physics
Things you need to know for IGCSE Physics:
K = °C + 273
K = temperature in Kelvin
°C = temperature in Celsius
P1V1 = P2V2 = constant
P = pressure
V = volume
P1 / T1 = P2 / T2 = constant
T = temperature in Kelvin
A diver works in the sea on a day when the atmospheric pressure is 101 kPa. The diver uses compressed air to breathe under water. 1700 litres of air from the atmosphere is compressed into a 12-litre gas cylinder. The compressed air quickly cools to its original temperature. Calculate the pressure of the air in the cylinder.
P1V1 = P2V2
101 x 1700 = P2 x 12
pressure of air in the cylinder = 101 x 1700 / 12 = 14000 kPa
The gas in a cylinder has a pressure of 210kPa at a temperature of 27°C. Calculate the new pressure when the temperature of the gas rises to 81°C.
27°C = (27+273)K = 300K
81°C = (81+273)K = 354K
P1 / T1 = P2 / T2
210 / 300 = P2 / 354
P = 210 x 354 / 300 = 247.8 kPa
A student blows up two balloons to the same size.She puts one balloon into a freezer. After a while, the student compares the two balloons. The balloon that has been cooled is smaller.
(a) Use ideas about particles to explain why the cooled balloon is smaller.
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