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a mixture of gases that surrounds Earth


the process by which a gas changes to a liquid


a collection of tiny droplets or ice crystals that hangs in the air

air mass

a large body of air with similar properties all through it


a boundary between air masses with different temperatures


the average weather conditions in an area over a long period of time


a measure of how hot or cold something is


the amount of water vapor in the air

air pressure

The force of air against earth's surface


An instrument used to measure temperature


an instrument used to measure air pressure

wind vane

a tool that shows the direction from which the wind is blowing


the process by which a liquid changes into a gas

water vapor

water in the form of a gas


to change state from a liquid to a solid


The falling to earth of any form of water (rain or snow or hail or sleet or mist)

water cycle

the continuous movement of water between Earth's surface and the air, changing from liquid to gas to liquid


to change state from a solid to a liquid

warm front

a boundary between air masses that allows a warm air mass to slide up and over a cold air mass

cold front

the boundary where a cold air mass moves under a warm air mass

stationary front

a boundary between air masses that are not moving


A prediction of what the weather will be like in the future


the directed flow of a gas or liquid

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