| Atmospheric |
Having to do with the atmosphere. For example, "atmospheric conditions" refer to
conditions in the atmosphere.
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| Barometer |
An instrument used by weather forecasters and scientists to measure air pressure
at any given moment for a particular place. Air pressure is usually measured in
millibars or in inches of mercury.
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| Molecules |
Molecules are the tiny particles which form various substances. For example, air is
composed of many billions of oxygen, nitrogen and Carbon Dioxide molecules.
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| Pressure |
Pressure is the force exerted on an object by something else. For example, when pressing
a tack into the wall, you are exerting pressure on the wall through the tack.
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| Volume |
The space that contains an object. In the case of a gas (or air) the volume of the container will tell you the volume of the gas.
Volume is typically measured in liters or milliliters.
For example, an open 1-liter bottle at sea-level contains 1-liter of air.
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| Wind |
Wind is the movement of air from a higher pressure zone to a lower pressure zone. This
phenomenon can be observed while opening a bottle of soda, the compressed gas in the soda
bottle escapes as the bottle is opened which causes a small wind around the opening for a
second.
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