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A Mercury barometer is a 1 meter long glass tube with the top sealed and turned upside down in a bath of mercury the pressure on the surface of the bath of mercury lifts the level of the mercury in the tube dependent on atmospheric pressure.
Age is not directly related to proximity to the sun. Time dilation near massive objects like the sun is the result of general relativity, but the effect is not significant enough near the sun to make people age significantly faster. Other factors like radiation exposure would have a more immediate impact on health and aging.