Bair, Chapter 1: The Atmosphere
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| weather | the condition of earth's atmosphere at a particular time and place
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| atmosphere | the envelope of gases that surrounds the planet
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| ozone | a form of oxygen that has three oxygen atoms in each molecule
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| water vapor | water in the form of a gas
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| density | the amount of mass in a given volume
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| pressure | the force pushing on an area or surface
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| air pressure | the result of the weight of a column of air pushing down on an area
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| barometer | an instrument that is used to measure air pressure
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| mercury barometer | a glass tube open at the bottom end and partially filled with mercury; measures air pressure
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| aneroid barometer | an airtight metal chamber sensitive to changes in air pressure
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| altitude | elevation; distance above sea level; the average of the surface of the oceans
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| list three factors affecting air pressure | temperature, altitude, water vapor content
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| troposphere | the layer of the atmosphere in which Earth's weather occurs
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| What is the rate at which temperature decreases in the troposphere? | drops 6.5 degrees celsius for every kilometer in altitude
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| stratosphere | second layer of atmosphere; contains the ozone layer
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| Describe the temperature change in the stratosphere | Temperature begins very cold (-60 c) but warms with increasing altitude due to the ozone layer
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| mesosphere | middle layer of the atmosphere
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| What is a main characteristic of the mesosphere | protects earth's surface from being hit by most meteoroids.
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| Define: Thermosphere | outermost layer; has no definate outer limit; thermo- means heat
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| Describe the Ionosphere | lower part of the thermosphere; engery from sun causes gas molucules to become electrically charge particles called ions; auroras occur; radio waves bounce here
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| Describe the Exosphere | Outer layer of thermosphere;
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