A gas cylinder of volume 0.052 m3 contains oxygen gas at a temperature of 22°C and a pressure of 2.0 × 105 Pa. Some of the oxygen in the cylinder is used and the gas pressure falls to 1.6 × 105 Pa. The temperature remains constant. Calculate the number of molecules removed from the cylinder

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blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.