temperature activity
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temperature — [1] degree of hotness or coldness as measured by a thermometer. [2] Measurement of speed of motion of molecules. [3] The measure of heat intensity or concentration, expressed in degrees. Measured by a thermometer. Temperature is not a measure of… … Dictionary of automotive terms
activity — See catalytic activity low temperature activity specific activity … Dictionary of automotive terms
low temperature activity — A description of the ability of a catalytic converter to purify exhaust gases in the warm up phase following a cold start. This phase is included in most of the current exhaust emission test procedures, as CO and HC concentrations are… … Dictionary of automotive terms
Activity (chemistry) — In chemical thermodynamics, activity (symbol a) is a measure of the “effective concentration” of a species in a mixture, meaning that the species chemical potential depends on the activity of a real solution in the same way that it would depend… … Wikipedia
Temperature-responsive polymer — A temperature responsive polymer is a polymer which undergoes a physical change when external thermal stimuli are presented. The ability to undergo such changes under easily controlled conditions makes this class of polymers fall into the… … Wikipedia
temperature increase requirement — abbr. TIR A measure of the loss in a catalyst’s activity; reactions invariably go faster at higher temperatures, and the TIR measures the increase in temperature to bring activity back to a previous level; it may also measure the increase of… … Petroleum refining glossary
Temperature record of the past 1000 years — The temperature record of the past 1,000 years describes the reconstruction of temperature for the last 1000 years on the Northern Hemisphere. A reconstruction is needed because a reliable surface temperature record exists only since about 1850.… … Wikipedia
temperature-sensitive mutation — (= ts mutation) A type of conditional mutation in organism, somatic cell or virus that makes it possible to study genes whose total inactivation would be lethal. Such ts mutations can also make possible studies of the effect of reversible… … Dictionary of molecular biology
temperature change — noun a process whereby the degree of hotness of a body (or medium) changes (Freq. 1) • Hypernyms: ↑natural process, ↑natural action, ↑action, ↑activity • Hyponyms: ↑advection, ↑ … Useful english dictionary
temperature-sensitive oculocutaneous albinism — a phenotypic variant of oculocutaneous albinism type 1b in which activity of the abnormal tyrosinase ceases above 35°C, so that the hair on warmer areas of the body is light and becomes progressively darker on the cooler areas (the extremities) … Medical dictionary
