calorie

calorie
(cal)
   the CGS unit of heat energy. This calorie (also called a gram calorie or small calorie) is the amount of heat required at a pressure of one atmosphere to raise the temperature of one gram of water by one degree Celsius. Unfortunately, this varies with the temperature of the water, so it is necessary to specify which degree Celsius is meant. A traditional choice was the degree from 14.5°C to 15.5°C; raising the temperature of water through this range requires 4.1858 joules, a quantity called the 15° calorie. Another choice produces the thermochemical calorie, equal to exactly 4.184 joules. More common today is the international steam table calorie, or IT calorie for short, defined by an international conference in 1956 to equal exactly 4.1868 joules, exactly 1.163 milliwatt hours, or about 0.003 968 32 British thermal units (Btu). The name of the unit comes from the Latin calor, heat.

Dictionary of units of measurement. 2015.

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  • calorie — [ kalɔri ] n. f. • 1824; lat. calor → chaleur 1 ♦ Métrol. Ancienne unité de mesure de quantité de chaleur (abrév. cal), valant 4,184 joules. vx Petite calorie : calorie. Grande calorie : 1 000 calories. ⇒ kilocalorie. 2 ♦ Unité de mesure de la… …   Encyclopédie Universelle

  • Calorie — (unité) Pour les articles homonymes, voir Cal …   Wikipédia en Français

  • calorie — CALORÍE, calorii, s.f. Unitate de măsură egală cu cantitatea de căldură care ridică temperatura unui gram de apă distilată de la 19,5 la 20,5 °C; unitate de măsură care indică valoarea energetică a unui aliment. ♢ (fiz.) Calorie mare =… …   Dicționar Român

  • calorie — [kal′ə rē] n. [Fr < L calor, heat; akin to calere, to be warm < IE base * kel , warm > OE hlēowe, warm] 1. the amount of heat needed to raise the temperature of one gram of water one degree celsius; gram calorie; small calorie 2.… …   English World dictionary

  • calorie — 1866, from Fr. calorie, from L. calor (gen. caloris) heat, from PIE *kle os , suffixed form of root *kele (1) warm (Cf. L. calidus warm, calere be hot; Skt. carad harvest, lit. hot time; Lith. silti …   Etymology dictionary

  • calorie — ► NOUN (pl. calories) 1) (also large calorie) a unit of energy, often used in specifying the energy value of foods, equal to the energy needed to raise the temperature of 1 kilogram of water through 1 °C (4.1868 kilojoules). 2) (also small… …   English terms dictionary

  • calorie — originally a unit of heat (from Latin calor, ‘heat’), in the 20c has stepped out of the physics laboratory into general use as a measure of the energy value of food. The general public have adopted what physicists call the large calorie (i.e. the …   Modern English usage

  • Calorie — Cal o*rie, n. [F., fr. L. calor heat.] (Physics) The unit of heat according to the French standard; the amount of heat required to raise the temperature of one kilogram (sometimes, one gram) of water one degree centigrade, or from 0[deg] to… …   The Collaborative International Dictionary of English

  • Calorie — This article is about the unit of energy. For its use in nutrition and food labelling regulations, see the article on food energy. The calorie is a pre SI unit of energy, in particular, heat.International Standard ISO 31 4: Quantities and units – …   Wikipedia

  • calorie — /kal euh ree/, n. 1. Thermodynam. a. Also called gram calorie, small calorie. an amount of heat exactly equal to 4.1840 joules. Abbr.: cal b. (usually cap.) kilocalorie. Abbr.: Cal 2. Physiol. a. a unit equal to the kilocalorie, used to express… …   Universalium

  • Calorie — A unit of food energy. In nutrition terms, the word calorie is used instead of the more precise scientific term kilocalorie. A kilocalorie represents the amount of energy required to raise the temperature of a liter of water one degree centigrade …   Medical dictionary

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