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atmosphere

a mixture of gases that surrounds Earth

condensation

the process by which a gas changes to a liquid

cloud

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

front

a boundary between air masses with different temperatures

climate

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

temperature

a measure of how hot or cold something is

humidity

the amount of water vapor in the air

air pressure

The force of air against earth's surface

thermometer

An instrument used to measure temperature

barometer

an instrument used to measure air pressure

wind vane

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

evaporation

the process by which a liquid changes into a gas

water vapor

water in the form of a gas

freeze

to change state from a liquid to a solid

precipitation

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

melt

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

forecast

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

current

the directed flow of a gas or liquid

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