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Answer -
Air contains a large amountof nitrogen and the solubility of gases in liquids increases with increase inpressure. When sea divers dive deep into the sea, large amount of nitrogendissolves in their blood. When they come back to the surface, solubility ofnitrogen decreases and it separates from the blood and forms small air bubbles.This leads to a dangerous medical condition called bends. Therefore, air inoxygen cylinders used for diving is diluted with helium gas. This is done as Heis sparingly less soluble in blood.