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30.5 inches of mercury are equal to a barometric pressure of 1021 millibars.

Add 0.0295301 to the millibar value to convert it to inches of mercury.

The amount that tissue can expand is constrained when the barometric pressure is high because it exerts more pressure against our bodies. Conversely, when air pressure is low, our body's tissues are able to expand more, which increases pressure on our nerves and other body parts. Barometric pressure, to put it simply, is the measurement of air pressure in the atmosphere, more specifically, the measurement of the weight that air molecules exert at a specific location on Earth. The earth is being pressed down on by the weight of the surrounding air, or barometric pressure. Air pressure is another name for it. When the barometric pressure is low, the air above is rising and when it is high, the air above is sinking. High pressure therefore indicates calm weather, while low barometric pressure denotes bad weather.

Learn more about  barometric pressure here:

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