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13 Cards in this Set
- Front
- Back
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Density |
the amount of mass in a given volume of air. Calculated by v/m |
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Air Pressure |
the force pushing on an area or surface, as if there was a column of air pushing down on an area. That column of air extends upward through the entire atmosphere. Air pushes in all directions so you are not crushed. |
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Barometer |
an instrument used to measure air pressure. There are two types: Mecury, and aneroid, with a tight metal air chamber. |
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Units of Air Pressure |
most weather reports use inches of mercury (what we record daily)The National Weather Service maps use millibars of pressure. |
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Altitude |
The distance above sea level, or elevation. Air pressure decreases as altitude increases. As air pressure decreases, so does density. The higher, the more spread out air molecules are. |
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Weather |
The condition of the Earth's atmosphere at a given time and place. |
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Atmosphere |
The envelope of gases that surround the planet, including dust, and liquid. It contains ozone which reflects solar radiation, burns up meteors and space debris, provides the earth with essential gases for life, and traps heat. It has the right amounts of gases, water vapor, and temperature to sustain life. It is constantly changing. |
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Nitrogen |
The most abundant gas in the atmosphere at 78%. Makes up 3/4th of the air we breathe. Is composed of 2 nitrogen (N2) molecules bonded together. |
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Oxygen |
2nd most abundant gas in the atmosphere. Makes up less than 1/4th of the air we breathe. Contains 2 oxygen molecules bonded together. Oxygen reacts with steel to create iron oxide, or rust. |
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Ozone |
A form of oxygen that has three oxygen molecules bonded together. Ozone absorbs or reflects most of the Ultra Violet rays that enter the atmosphere. Ozone is the odor you smell after the thunderstorm. |
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Carbon Dioxide |
Is made from one molecule of carbon and two molecules of oxygen. It is essential to plants as it is the key material needed for photosynthesis. It is created by burning fossil fuels and decaying plant or animal material. |
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Water Vapor |
Water in the form of gas. ls invisible , amount changes from area to area. Warm air holds more than cold air. As warm air rises the water vapor condenses on condensation nuclei to form water droplets that eventually become clouds we can see. When clouds are saturated they fall as precipitation. |
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What were to happen to your ears if you climbed a high mountain? |
The air pressure in them is greater than the outside air pressure, so they would pop as they stabilize themselves. |
