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air pressure

the amount that air presses or pushes on anything


a tool that measures air pressure

air mass

a large body of air that has about the same temperature and humidity


often move very quickly across the sky on bright, sunny days. Cirrus clouds often mean that warm air is on the way.

wind vane

a tool that shows wind direction


the line where two air masses meet


a tool that measures humidity


often seen during fair weather; dome shaped with flat bottoms. Form as warm moist air moves high into the sky.

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