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Ch 3 Atmosphere
| Term | Definition |
|---|---|
| Weather | The condition of Earth's atmosphere at a particular time and place. |
| atmosphere | The envelope of gases that surrounds Earth. |
| Water Vapor | Water in the form of Gas. |
| Density | The ratio of the mass of a substance to its volume. |
| Air Pressure | The pressure caused by the weight of a column of air pushing down on a area. |
| Barometer | An instrument used to measure changes in air pressure. |
| Mercury Barometer | An instrument that measures changes in air pressure, consisting of a glass tube partially filled with Mercury, with its open end resting in a dish of Mercury. |
| Aneroid Barometer | An instrument that measures changes in air pressure without using a liquid. |
| Altitude | Elevation above sea level. |
| Troposphere | The lowest layer of Earth's atmosphere. |
| Stratosphere | The second- lowest layer of Earth's atmosphere. |
| Mesosphere | The layer of Earth's atmosphere immediately above the stratosphere. |
| Thermosphere | The outermost layer of Earth's atmosphere. |
| ionosphere | The lower part of the thermosphere. |
| Exosphere | The outermost layer of the thermosphere. |
| Electromagnetic waves | A wave that transfer electric and magnetic energy through the vacuum of space. |
| Radiation | The transfer of energy by electromagnetic waves. |
| infrared radiation | Electromagnetic waves with wavelengths that are longer than visible light but shorter than microwaves, |
| Ultraviolet radiation | Electromagnetic waves with wavelengths that are shorter than visible light but longer than X- waves. |
| Scattering | Reflection of light in all directions |
| greenhouse effect | The trapping of heat, near a plant's surface by certain gases in the plant's atmosphere. |