Air has mass, why does it not fall down due to gravity? The pressure from below

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Air has mass, why does it not fall down due to gravity? The pressure from below gives a force equal and opposite to the weight The pressure from above gives a force equal and opposite to the weight The pressure from below gives a force equal and opposite to the combination of the weight and the force from the pressure from above The pressure above a lake is 101300Pa. The density of water is 1000kg/m^3, what is the pressure lm below the surface? 9810Pa 101300 - 9810Pa 101300 + 9810Pa None of the above

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