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weather unit vocab

Atmosphere the mixture of gasses that sorounds the air
Air pressure the measure of the force with which particles in the air push on an area of a surface
troposphere lowest layer of the atmosphere
stratosphere layer of the atmosphere above the troposphere
mesosphere layer above the stratosphere
ionosphere layer above the mesosphere
exosphere layer above the ionosphere
thermosphere outermost layer of the atmosphere
ozone layer the area of the stratosphere with lots of ozone
greenhouse effect when gasses in the atmosphere absorb and give off infared radiation
temperature a measure of the average kinetic energy of particles
thermal energy total kinetic energy of particles
thermal expansion the increase in volume that results from an increase in temperature
heat the energy that is transferred between two objects that are at different temperatures
radiation the transfer of energy through electromagnetic waves
convection the transfer of energy due to the movement of matter
conduction the transfer of energy through direct contact
wind the movement of air caused by differences in air pressure
Coriolis effect the apparent curving of the path of a moving object from an otherwise straight path due to earth's rotation.
jet stream narrow belts of high speed winds that blow west to east, between 7 km and 16 km above earths surface
local wind the movement of air over short distances
sea breeze a cool breeze coming off the sea
land breeze when wind blows from the land to the water
mountain breeze when wind goes down into a valley
valley breeze when a breeze goes out from a valley
global wind pressure belts every 30 degrees of latitude and the Coriolis effect produces patterns of calm areas of wind
trade wind this brings cold air to warmer parts
westerlies wind travelling from west to east
plolar easterlies wind travelling from east to west in the polar region
doldrum trade winds from both hemispheres
horse latitudes when air stops moving and sinks
weather the condition of earth's atmosphere at a given time and place
humidity the amount of water vapor in the air
relative humidity the water vapor in the air compared to the needed water vapor to reach saturation
dew point when more condensation than evaporation occures
precipitation ant form of water that falls to earth
cirrus cloud forming wispy streaks at low altitude
cumulus a cloud forming surrounded masses heaped on each other at a low altitude
stratus a cloud forming a continuous horizontal gray sheet, often with rain or snow
air pressure (density) force of air's molecules pushing on an area
high pressure system a condition of the atmosphere in which the pressure is above average
low pressure system when the pressure is below average
air mass a body of air with horizontally uniform temperature, humidity, and pressure
front the boundary between two air masses that have different temperatures or humidity
warm front when warm air masses follows a warm air mass
cold front when cold air pushes warm air up
stationary front when a warm/cold front stays still
occulded to force air upward from earths surface
evaporation when liquid water turns into water vapor
condensation the change of state from a gas to a liquid
runoff streams, rivers, and the water that flows over land
Created by: Fs5158