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barometer
An instrument that measures atmospheric pressure
air pressure
The measure of the force with which air molecules push on a surface
altitude
Elevation above sea level
air temperature
the measure of the average kinetic energy of molecules in the air
thermometer
An instrument used to measure temperature
Millibars
Metric unit of atmospheric pressure
inches of mercury
units for air pressure (in of mg)
Kelvin
SI unit for temperature
Celsius
Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
Fahrenheit
A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees
atmosphere
A thin layer of gases surrounding Earth
Troposphere
0-17 km above Earth's surface, site of weather, organisms, contains most atmospheric water vapor. (temperature decreases with increasing altitude, pressure decreases)
Mesosphere
The layer of Earth's atmosphere immediately above the stratosphere
Stratosphere
2nd layer of atmosphere; extends from 10 to 30 miles up; location of ozone layer; absorbs 95% of Ultraviolet radiation; temperature increases with altitude increase.
Ozone
A form of oxygen that has three oxygen atoms in each molecule instead of the usual two.
ultraviolet radiation
a type of energy that comes to Earth from the Sun, can damage skin and cause cancer, and is mostly absorbed by the ozone layer
mesopause, stratopause, tropopause
boundaries between layers of the atmosphere
isobar
A line on a weather map that joins places that have the same air pressure
isotherm
A line on a weather map that joins places that have the same temperature.
high pressure system
a large body of circulating air with high pressure at its center and lower pressure outside of the system
low pressure system
a large body of circulating air with low pressure at its center and higher pressure outside of the system
anticyclone
A high-pressure center of dry air
cyclone
A swirling center of low air pressure