temperature (tem´per-a-chur)

The sensible intensity of heat of any substance; the manifestation of the average kinetic energy of the molecules making up a substance due to heat agitation. See also scale. [L. temperatura, due measure, temperature, fr. tempero, to proportion duly]
absolute t. (T) t. reckoned in Kelvins from absolute zero.
basal body t. the t. at rest, usually obtained on arising in the morning, without any influences that might increase it; gives indirect evidence of ovulation.
critical t. the t. of a gas above which it is no longer possible by use of any pressure, however great, to convert it into a liquid.
denaturation t. of DNA that t. at which, under a given set of conditions, double-stranded DNA is changed (50%) to single-stranded DNA; under standard conditions, the base composition of the DNA can be estimated from the denaturation t., since the greater the denaturation t., the greater the guanine-plus-cytosine content (i.e., GC content) of the DNA.melting t. of DNA;
effective t. a comfort index or scale which takes into account the t. of air, its moisture content, and movement.
equivalent t. the t. of a thermally uniform enclosure in which, under still air conditions, a "sizable" black body loses heat at the same rate as in the nonuniform environment.
eutectic t. the t. at which a eutectic mixture becomes fluid (melts).
fusion t. (wire method) the recorded t. at which a 20-gauge metal wire will collapse under a 3-ounce load; the recorded t. at which porcelain becomes glazed.
maximum t. in bacteriology, denoting a t. above which growth will not take place.
mean t. the average atmospheric t. in any locality for a designated period of time, as a month or a year.
melting t. t. midpoint
melting t. of DNA denaturation t. of DNA
t. midpoint (Tm, tm) the midpoint in the change in optical properties (absorbance, rotation) of a structured polymer (e.g., DNA) with increasing t.melting t;
minimum t. in bacteriology, denoting a t. below which growth will not take place.
optimum t. the t. at which any operation, such as the culture of any special microorganism, is best carried on.
room t. (RT, rt) the ordinary t. (65° to slightly less than 80°F, 18.3° to 26.7° C) of the atmosphere in the laboratory; a culture kept at room t. is one kept in the laboratory, not in an incubator.
sensible t. the atmospheric t. as felt by the individual, supposed to be that recorded by the wet-bulb thermometer.
standard t. a t. of 0°C or 273.15° absolute (Kelvin).


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