Air is all around you. It starts at the ground and goes up all the way to the top of the sky. In this factsma short, we briefly answer how much does the our sky weigh?

Air pressure can be measured with a tool called a barometer. The air pressure reading on a barometer is called the barometric pressure. Meteorologists use barometers to detect changes in air pressure which often signal changes in the weather.

A drop in barometric pressure means a storm is probably on the way. On the other hand, a rise in barometric pressure usually foretells sunny skies.

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