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29 Cards in this Set
- Front
- Back
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Kinetic energy
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The energy within a body that is a result of motion.
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Temperature
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The degree of hotness or coldness of a a substance as measured by a thermometer. It is also a measure of the average speed of kinetic energy of atoms and molecules in a substance
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absolute zero
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A temperature reading of
-273 degrees C,-460 F,or 0K. Theorerically there is no molecular motion at this temperature. |
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heat
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A form of energy transferred between systems by virtue of theur temerature diffrences.
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Kelvin scale
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A temperature scale with zero degrees equal to the theoretical temperature at which all molecular motion ceases.
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Fahrenheit scale
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A temperature scale where 32 is assigned to the temperature at which water freezes and 212 to the temperature which water boils
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Celsius scale
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A temperature scale where zero is assigned to the temperature where water freezes and 100 to the temperature which water boils
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latent heat
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The heat that is either released or absorbed by a unit mass of a substance when it undergoes a change of state, such as during evaporation, condensation, or sublimation
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sensible heat
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The heat we can feel and measure with a therometer
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conduction
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The transfer of heat by molecular activity from one substance to another, or through a substance. Transfer is always from warmer to colder regions.
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convection
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Motions in fluid that result in the transport and mixing of the fluid's properties. In meteorology, convection usually refers to atmospheric motions that are predominantly vertical, such as rising air currents due to surface heating. The rising of heated surface air and the sinking of cooler air aloft is often called free convection.
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thermals
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A small rising parcel of warm air produced when the earth's surface is heated unevenly.
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advection
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The horizontal transfer of any atmospheric property by the wind.
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Radiant energy
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Energy propagated in the form of electromagnetic waves. These waves do not need molecules to propagate them and in a vacuum they travel at bearly 300,000 km per sec
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electromagnetic waves
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These waves do not need molecules to propagate them and in a vacuum they travel at bearly 300,000 km
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micrometer
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A unit of lenth equal one millionth of a meter
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photons
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A discrete quantity of energy that can be thought of as a packet of electromagnetic radiation traveling at the speed of light.
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visible region
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Radiation with a wavelength between .4 and .7 um. This region of the electromagnetic spectrum is called the visible region.
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infrared radiation
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Electromagnetic raiation with wavelengths between about0.7 and 1000 um. This raiaition is longer than visible radiation but shorter than microwave radiation.
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blackbody
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A hypothetical object that absorbs all the radiation that strikes it. It also emits radiation at a maximum rate for its given temperature.
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greenhouse effect
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The warming of an atmosphere by its absorbing and emitting infrared radiation while allowing shortwave radiation to pass on through. The gases mainly responsible fir the earth;s atmospheric greenhouse effect are water vapor and carbon dioxide.
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atmospheric window
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The wavelength range between 8 and 11 um in which little absorption of infrared radiation takes place
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albedo
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The percent of radiation returning from a surface compared to which strikes it.
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aurora
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Glowing lightdisplay in the nighttime sky caused by excited gases in the upper atmosphere giving off light. In the Northern Hemisphere it is called the aurora borealis,in the Southern Hemisphere the aurora australis
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Summer Solstice
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Approximately June 21 in the Northern Hemisphere when the sun is highest in the sky and directly overhead at latitude 23 1/2 N, The tropic Cancer
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Autumnal equinox
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The equinox at which the sun approaches the Southern Hemisphere and passes directly over the equator. Occurs around September 23
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Indian summer
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An unreasonably warm spell with clear skies near the middle of autumn. Usually follows a substantial period of cool weather.
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Winter solstice
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Approximately December 21 in the Northern Hemisphere when the sun is lowest in the sky and directly overhead at latitude 23 1/2 S, the Tropic of Caprocorn.
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Vernal equinox
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The equinox at which the sun approaches the Northern Hemisphere and passes directly over the equator. Occurs around March 20
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