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Chapter 16, Weather
Weather Vocabulary Words
| Term | Meaning |
|---|---|
| weather | the condition of the atmosphere at a particular time and place |
| water cycle | the continous movement of water from water sources into the air; onto land; into and over the ground, and back to the water sources |
| humidity | the amount of water vapor or moisture in the air |
| relative humidity | the amount of moisture the air contains compared with the maximum amount it can hold at a particular temperature |
| condensation | the change of state from a gas to a liquid |
| dew point | the temperature to which air must cool to be completly saturated |
| cloud | a collection of millions of tiny water droplets of ice crystals |
| air mass | a large body of air that has a similar temperature and moisture throughout |
| front | the boundary that forms between two different air masses |
| thunderstorm | small, intense weather systems that produce strong winds, heavy rain, lightning and thunder |
| lightning | the large electrical discharge that occurs between two oppositely charged surfaces |
| precipitation | solid or liquid water that falls from the air to the Earth |
| tornado | a small, rotating column of air that has high wind speeds and low central pressure and that touches the ground |
| hurricane | a large, rotating tropical weather system with wind speeds of at least 199km/h |
| thermometer | a tool used to measure air temperature |
| barometer | an insturment used to measure air pressure |
| windsock | a device used to measure wind direction, usually seen at airports |
| wind vane | a device used to measre wind direction, usually seen at homes |
| anemometer | a device used to measure wind speed |
| isobars | lines that connect points of equal air pressure |