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absolute zero the lowest possible temperature for any known substance, equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit.
C1 abbreviation of "Celsius," or "Centigrade," of, pertaining to, or designating a temperature scale on which zero degrees is the freezing point and one hundred degrees is the boiling point of water.
cal.2 abbreviation of "small calorie," or "small calories," a unit of heat equal to the amount necessary to raise the temperature of one gram of water one degree Celsius, also known as "gram calorie."
calorie a unit of heat equal to the amount necessary to raise the temperature of one gram of water one degree Celsius; gram calorie; small calorie. (abbr.: cal.) [2/3 definitions]
centigrade see Celsius.
gallium a silvery metal chemical element that has thirty-one protons in each nucleus, usu. forms a trivalent ion, and is often used in pure form in high-temperature thermometers because it melts at just above room temperature and remains liquid up to 1983 degrees Celsius. (symbol: Ga)
Kelvin a thermodynamic temperature scale whose degree intervals correspond to those of the Celsius scale and in which zero degrees, or absolute zero, is equal to -273.15 degrees Celsius. [1/3 definitions]
nitrogen nitrogen chilled below -196 degrees Celsius so that it is a liquid, used as a refrigerant and quick-freezing agent. [1/3 definitions]
roentgen a unit of x-radiation or gamma radiation equal to the amount that produces, in 0.001293 gram or one cubic centimeter of dry air at zero degree Celsius and standard atmospheric pressure, one electrostatic unit of electricity.
tin a chemical element that has fifty protons in each nucleus and that occurs in pure form as a malleable, corrosion-resistant, silvery white metal solid darkening to gray below about thirteen degrees Celsius, used in a variety of alloys such as bronze and pewter and as corrosion-resistant plating and solder. (symbol: Sn) [1/8 definitions]