11 terms

Ch 11 Atmosphere PART #1

Glencoe Earth Science: Geology, the Environment, and the Universe
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Terms in this set (...)

Atmosphere
The blanket of gases surrounding the earth. It contains 78% nitrogen, 21% oxygen.
Heat
The energy transfer that occurs because of a difference in temperature between two substances. The energy flows from the object with a higher temperature to an object with a lower temperature.
Radiation
The energy transfer through space by visible light, UV radiation, and other forms of eletromagnetic waves.
Conduction
The energy transfer that occurs when molecules collide with each other. It can only occur when substances are IN CLOSE CONTACT with each other.
Convection
The energy transfer by the flow of a heated substance (occurs with liquids and gases). It is caused by uneven heating - one part of the liquid or gas is hotter and is less dense and rises.
Temperature
The measurement of how quickly or slowly molecules move around. Usually measured in degrees Celsius or Kelvin.
Dew Point
The temperature to which air must be cooled to reach saturation and at which condensation begins. (AKA Condensation Point)
Saturation
The point at which air is holding as much water vapor as it possibly can. AKA 100% relative humidity.
Condensation
Phase change when a cooling gas changes into a liquid.
Humidity
The ACTUAL/absolute measured amount of water vapor present in the air.
Relative Humidity
The ratio of the ACTUAL amount of water vapor that air contains compared to the maximum amount it CAN hold at a specific temperature. Expressed as a percent.

Equation:
Relative Humidity = Actual Humidity /Capacity x 100%