1) Astronomical imaging 2) Solar energy
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https://www.crosswordclues.com/clue/air-mass
In meteorology, an air mass is a volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of square miles, and adopt the characteristics of the surface below them. They are classified according to latitude and their continental or maritime source regions. Colder air masses are termed polar or ar...
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http://en.wikipedia.org/wiki/Air_mass
[solar energy] The air mass coefficient defines the direct optical path length through the Earth`s atmosphere, expressed as a ratio relative to the path length vertically upwards, i.e. at the zenith. The air mass coefficient can be used to help characterize the solar spectrum after solar radiation has traveled through the atmosphere. The ai...
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http://en.wikipedia.org/wiki/Air_mass_(solar_energy)
A large body of air having similar horizontal temperature and moisture characteristics.
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http://ggweather.com/glossary.htm
An extensive body of the atmosphere in which physical properties, particularly temperature and humidity, exhibit only small and continuous differences in the horizontal. It may extend over an area of several million square kilometers and over a height of several kilometers.
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http://nsidc.org/arcticmet/glossary/air_mass.html
An extensive body of air throughout which the horizontal temperature and moisture characteristics are similar.
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http://www.avon-weather.com/glossary.html
A large body of air with the fairly uniform temperature and humidity of its source region.
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http://www.bbc.co.uk/weather/weatherwise/glossary/a.shtml
in meteorology, large body of air having nearly uniform conditions of temperature and humidity at any given level of altitude. Such a mass has ... [5 related articles]
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http://www.britannica.com/eb/a-z/a/33
A measure of how far light travels through the Earth's atmosphere. The Sun is continually releasing an enormous amount of radiant energy into space. The Earth receives a tiny fraction of this energy; yet, an average of 1367 watts (W) reaches each square meter (m
2) of the out...
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http://www.daviddarling.info/encyclopedia/A/AE_air_mass.html
A large body of air that has similar horizontal temperature and moisture characteristics.
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http://www.encyclo.co.uk/local/22268
A large body of air with nearly uniform temperature and moisture content. There are six recognised airmasses that affect the British Isles denoted by their source region and then subsequent track. Polar maritime-Pm Arctic maritime-Am Tropical maritime-Tm Tropical continental-Tc Polar continental-Pc Returning Polar maritime-rPm. Returning Polar mari...
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http://www.metcheck.com/OTHER/glossary.asp
A body of air whose temperature and humidity characteristics remain relatively constant over a horizontal distance of hundreds to thousands of kilometers. Air masses develop their climatic characteristics by remaining stationary over a source region for a number of days. Air masses are classified according to their temperature and humidity charact....
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http://www.physicalgeography.net/physgeoglos/a.html
A widespread body of air with consistent temperature and moisture characteristics.
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http://www.stormfax.com/wxwords.htm
a large body of air all of similar temperature and humidity.
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http://www.tsgc.utexas.edu/stars/metgloss.html
[
n] - a large body of air with uniform characteristics horizontally
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http://www.webdictionary.co.uk/definition.php?query=air%20mass
A large body of air that has similar temperature, pressure and moisture properties.
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https://geographyfieldwork.com/GeographyVocabularyGCSEClimate.htm
an extensive body of air throughout which the horizontal temperature and moisture characteristics are similar.
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https://serc.carleton.edu/eslabs/weather/glossary.html
A large volume of air with certain meteorological or polluted characteristics--e.g., a heat inversion or smogginess--while in one location. The characteristics can change as the air mass moves away.
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https://www.encyclo.co.uk/local/20094
noun a large body of air with uniform characteristics horizontally
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https://www.encyclo.co.uk/local/20974
Large body of air with particular characteristics of temperature and humidity. An air mass forms when air rests over an area long enough to pick up the conditions of that area. When an air mass moves to another area it affects the weather of that area, but its own characteristics become modified in the process. For example, an air mass formed over ...
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https://www.encyclo.co.uk/local/21221
a body of air covering a relatively wide area, exhibiting approximately uniform properties through any horizontal section.
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https://www.infoplease.com/dictionary/air-mass
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