Unit 2: Weather

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21 Terms

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Phase Change

a transition of matter from one state to another

<p>a transition of matter from one state to another</p>
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Melting

The change in state from a solid to a liquid

<p>The change in state from a solid to a liquid</p>
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Freezing

The change of state from a liquid to a solid

<p>The change of state from a liquid to a solid</p>
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Boiling

The temperature at which a liquid changes to a gas

<p>The temperature at which a liquid changes to a gas</p>
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Vaporization

The change of state from a liquid to a gas

<p>The change of state from a liquid to a gas</p>
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Sublimation

A change directly from the solid to the gaseous state without becoming liquid

<p>A change directly from the solid to the gaseous state without becoming liquid</p>
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Condensation

The change of state from a gas to a liquid

<p>The change of state from a gas to a liquid</p>
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Dew Point

The temperature at which condensation begins

<p>The temperature at which condensation begins</p>
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Air Pressure

The measure of the force with which air molecules push on a surface

<p>The measure of the force with which air molecules push on a surface</p>
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Barometer

an instrument used to measure atmospheric pressure

<p>an instrument used to measure atmospheric pressure</p>
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Isobars

Lines joining places on the map that have the same air pressure

<p>Lines joining places on the map that have the same air pressure</p>
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Convection Cell

Cycle in which heated material rises and cooler material sinks

<p>Cycle in which heated material rises and cooler material sinks</p>
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Air Mass

A huge body of air that has similar temperature, humidity, and air pressure at any given height

<p>A huge body of air that has similar temperature, humidity, and air pressure at any given height</p>
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Warm Front

the front of an advancing mass of warmer air

<p>the front of an advancing mass of warmer air</p>
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Cold Front

A front where cold air moves in under a warm air mass.

<p>A front where cold air moves in under a warm air mass.</p>
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Stationary Front

A boundary between air masses that don't move possibly causing rain for several days

<p>A boundary between air masses that don't move possibly causing rain for several days</p>
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Occluded Front

a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow

<p>a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow</p>
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Anemometer

An instrument used to measure wind speed

<p>An instrument used to measure wind speed</p>
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Humidity

a measure of the amount of water vapor in the air

<p>a measure of the amount of water vapor in the air</p>
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Relative Humidity

The amount of water vapor in the air at any given time is usually less than that required to saturate the air. Expressed as a percentage.

<p>The amount of water vapor in the air at any given time is usually less than that required to saturate the air. Expressed as a percentage.</p>
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Jet Stream

A narrow belt of strong winds that blow in the upper troposphere

<p>A narrow belt of strong winds that blow in the upper troposphere</p>