| Term | Definition |
|---|
| weather | The condition of Earth's atmosphere at a particular time and place. |
| atmosphere | The envelope of gases that surrounds Earth. |
| ozone | A form of oxygen that has three oxygen atoms in each molecule instead of the usual two. |
| water vapor | Water in the form of gas. |
| Nitrogen, Oxygen, Carbon Dioxide, Water Vapor, particles of liquids and solids and many others | Compostition of Earths Atmosphere |
| 78% | Amount of Nitrogen |
| 21% | Amount of Oxygen |
| 1% | Amount of other gases |
| Density | The amount of mass of a substance in a given volume. |
| Pressure | The amount of force pushing on an area. |
| Air Pressure | The pressure caused by the weight of a column of air pushing down on an 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. |
| Mass over Volume | Density |
| Electromagnetic Waves | Waves that transfer electric and magnetic energy through the vacuum of space. |
| Radiation | The direct 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-rays. |
| Scattering | Reflection of light in all directions. |
| Greenhouse Effect | Gases in the atmosphere that rap energy. |
| Aneroid and Mercury Barometers | 2 kinds of barometers |
| Millibars and Inches of Mercury | Two different units used to measure air pressures |
| 21% | The percent of oxygen always in the air |
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