On earth it is responsible for air pressure. There are about 15 pounds of air above every square inch of the earth's surface. Or in other words, the volume of a column of air on Earth about a hundred miles high and a square inch in area weighs 15 pounds.
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You could measure the weight of a recipient with air, and compare it to one without air (with a vacuum instead).
At a temperature of 20 °C and a pressure of 101.325 kPa (standard pressure), dry air has a density of 1.2041 kg/m3.So the weight of 1 cubic meter of air under those conditions is 1.2041 kg.
If you ignore the small weight of air relative to the weight of water, then one litre of airSUBMERGED in water provides a buoyant force equal to the weight of one litre of water,which is about 9.8 newtons or 2.2 pounds.
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The pressure is due to the weight of all the air above a certain point. Pressure is simply weight per unit area.