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originally posted by: andy06shake
a reply to: InachMarbank
Let's just address the claim you made about how "Heaven and Earth are half of the gravitational force".
Still waiting for you to explain yourself on that score before we begin to address your nonsensical model.
Air is heavier (and thus easier to breathe) at sea level, since the air molecules sit close together, compressed by the weight of air from above. As elevation increases, however, air molecules spread farther apart, and the air becomes lighter.
Thinking in terms of air molecules, if the number of air molecules above a surface increases, there are more molecules to exert a force on that surface and consequently, the pressure increases. The opposite is also true, where a reduction in the number of air molecules above a surface will result in a decrease in pressure. Atmospheric pressure is measured with an instrument called a "barometer", which is why atmospheric pressure is also referred to as barometric pressure.
In aviation and television weather reports, pressure is given in inches of mercury ("Hg), while meteorologists use millibars (mb), the unit of pressure found on weather maps.
As an example, consider a "unit area" of 1 square inch. At sea level, the weight of the air above this unit area would (on average) weigh 14.7 pounds! That means pressure applied by this air on the unit area would be 14.7 pounds per square inch. Meteorologists use a metric unit for pressure called a millibar and the average pressure at sea level is 1013.25 millibars.