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weather and climate
| Term | Definition |
|---|---|
| troposphere | the lowest layer of the atmosphere where most water is found and most clouds form |
| thermometer | a tool used to measure temperature |
| barometer | an instrument that is used to measure air pressure and to predict changes in the weather |
| rain gauge | an instrument for measuring the amount of moisture in the air |
| hygrometer | an instrument for measuring the amount of moisture in the air |
| wind vane | a weather instrument used to determine the direction the wind is blowing |
| anemometer | an instrument for measuring the force or speed of the wind |
| high-pressure area | a mass of cold air |
| low-pressure air | a mass of warm air |
| water vapor | gas or moisture floating in the air;steam |
| fog | fine particles of water floating in the atmosphere near the ground |
| meteorologist | a person who studies , report and forecasts weather conditions |
| updrafts | an upward current of warm, moist air |
| wind | the horizontal movement of air |
| atmosphere | The layer of air that surrounds earth |
| air pressure | The weight of air |
| humidity | A measure of the amount of water in the air |
| precipitation | Any form of water that falls from clouds such as rain or snow |
| evaporation | The process by which a liquid changes into a gas |
| condensation | The process by which a gas changes back into a liquid |
| local winds | The winds dependent upon local changes in temperature |
| prevailing winds | The global winds that blow constantly from the same direction |
| air mass | A large body of air that has nearly the same temperature and humidity throughout |
| front | The boundary between air masses |
| climate | The average of all weather conditions through all seasons over a period of time |
| microclimate | The climate of a very small area |
| El Nino | A short-term climate change that occurs every two to ten years |
| green house effect | Progress by which the earth atmosphere absorbs heat |
| global warming | The hypothesized rise in earth's average temperature from excess carbon dioxide |