Kilocalorie: The term used to represent the amount of energy required to raise the temperature of a liter of water one degree centigrade at sea level. Already in 1928 there were serious complaints about the possible confusion arising from the two main definitions of the calorie and whether the notion of using the capital letter to distinguish them was sound. high in calories: a caloric meal. An athlete in training needs a lot of calories. 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The amount of energy required to warm one gram of air-free water from 3.5 to 4.5 °C at standard atmospheric pressure. Please tell us where you read or heard it (including the quote, if possible). A nutritional requirement or consumption is often expressed in calories or kilocalories per day. The small calorie or gram calorie (usually denoted cal) is the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius (or one kelvin). The modern calorie (cal) was first recognized as a unit of the cm-g-s system (cgs) in 1896,[6] Learn a new word every day. 2. Use of the calorie was officially deprecated by the ninth General Conference on Weights and Measures, in 1948.[8]. The energy in kilojoules E (kJ) is equal to 4.184 times the energy in thermochecmical / food kilocalories E (kcal): E (kJ) = 4.184 × E (kcal-th) International kilocalories to kilojoules. [15][16] The word calorie is commonly used with the number of kilocalories (kcal) of nutritional energy measured. For historical reasons, two main definitions of calorie are in wide use. Slippery Words Quiz—Changing with the Times. ≈ 2.615×1019 eV, ≈ 0.0039683 BTU The definition depends on the atmospheric pressure and the starting temperature. ≈ 2.6124×1019 eV, ≈ 0.003964 BTU Calorie relates directly to the metric system, and therefore to the SI system. By convention in food science, the large calorie is commonly called Calorie (with a capital C by some authors to distinguish from the smaller unit). A kilocalorie represents the amount of energy required to raise the temperature of a liter of water 1' centigrade at sea level. (The word calorie is used instead of the more precise scientific term kilocalorie.) The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. They refer to the amount of energy in foods and beverages, or the amount of energy you burn exercising. [10], The calorie was first defined specifically to measure energy in the form of heat, especially in experimental calorimetry.[14]. You can just say that it is the energy required to warm 1 gram of water by 1 degree, but that is a different value depending on if you are referring to ice, liquid water, or steam. — called also gram calorie, small calorie. In the past, a bomb calorimeter was used to determine the energy content of food by burning a sample and measuring a temperature change in the surrounding water. Show activity on this post. (From here on, when we use the term caloriewe mean food calorie.) The amount of energy required to warm one gram of air-free water from 14.5 to 15.5 °C at standard atmospheric pressure. The term entered French and English dictionaries between 1841 and 1867. To ease calculations, energy is expressed in 1000-calorie units known as kilocalories. The debate boils down to whether a… [21] Alcohol in food contains 7 kcal/g. [4] Thus, 1 kilocalorie (kcal) = 1000 calories (cal). [19] EU food labelling laws require both kilojoules and kilocalories on all nutritional labels, with the kilojoules listed first.[20]. There are several definitions of calorie: Thermochemical / food kilocalories to kilojoules. Accordingly, several different precise definitions of the calorie have been used. The calorie used in chemistry and biochemistry is equal to 4.184 joules. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'calorie.' ", International Organization for Standardization, "Excursion in Chemical Thermodynamics, from the Past into the Future", "The adoption of joules as units of energy", International Union of Pure and Applied Chemistry (IUPAC), "Calculating Calories by Burning Gummy Bears to Death", "Prospects improve for food energy labelling using SI units", "What's the difference between a calorie and a kilojoule", "Australia New Zealand Food Standards Code – Standard 1.2.8 – Nutrition information requirements", "Questions and Answers on the application of the Regulation (EU) N° 1169/2011 on the provision of food information to consumers", "How Do Food Manufacturers Calculate the Calorie Count of Packaged Foods? Send us feedback. “Calorie.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/calorie. Calorie is a measure of energy and does not measure weight or length. The modern (small) calorie is defined as the amount of energy needed to increase the temperature of 1 gram of water by 1 °C (or 1 K, which is the same increment). In other scientific contexts, the term calorie almost always refers to the small calorie. 1 calorie = 4.184 joules By definition, 1 calorie is the amount of heat required to raise the temperature of 1 gram of water by 1 degree Celsius or 33.8 Fahrenheit. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! It is also occasionally used to specify energy quantities that relate to reaction energy, such as enthalpy of formation and the size of activation barriers. Examples from the Corpus calorie • Carbohydrates contain 3.75 calories per gram whereas fat contains about nine calories. 1. Calories are a measure of energy. a unit equal to the amount of heat needed to increase the temperature of … In Australia, kilojoules are officially preferred over kilocalories, but kilocalories retain some degree of popular use. Not to be confused with the food Calorie (capital C), which is equal to 1 kilocalorie (1000 calories), or the amount of energy required to raise one kilogram of water by one degree Celsius. From the Latin calor (heat), a calorie is a specific amount of heat energy. Until 1948, the latter was defined as 4.1833 international joules; the current standard of 4.184 J was chosen to have the new thermochemical calorie represent the same quantity of energy as before. In the labeling of food products in the United States, a food calorie actually refers to a kilocalorie, or 1,000 calories. 2. ≈ 2.610×1019 eV, ≈ 0.003971 BTU Calorie Definition In Hindi, in the context of medicine, health, or physical fitness, refers to a reduction of the total body mass, due to a mean loss of fluid, body fat or adipose tissue or lean mass, namely bone mineral deposits, muscle, tendon, and other connective tissue. 1 kcal th = 4.184 kJ. What made you want to look up calorie? Defined as 1.163 mW⋅h = 4.1868 J exactly. ≈ 1.162×10−6 kW⋅h The reason for defining a specific starting point is to remove any doubt of how much energy 1 calorie is. The word “calorie” is defined as a unit of energy or energy that can increase the temperature of 1 litre of water to 1 degree Celsius. calorie noun [C] (FOOD) a unit of energy, often used as a measurement of the amount of energy that food provides: There are about 50 calories in an apple. For example, the energy released in a chemical reaction per mole of reagent is occasionally expressed in kilocalories per mole. Today, this method is not commonly used in the United States and has been replaced by calculating the energy content indirectly from adding up the energy provided by energy-containing nutrients of food (such as protein, carbohydrates, and fats), the Modified Atwater system. Can you spell these 10 commonly misspelled words? Depending on … Dictionary ... Calorie A unit of heat equal to the amount of heat needed to raise the temperature of 1,000 grams of water by one degree Celsius. That is, 1 Calorie is equivalent to 1 kilocalorie; the capital C in Calories denotes kcal on food labels, calories and kilocalories are used interchangeably to mean the same thing. Calorie Definition from Science & Technology Dictionaries & Glossaries. to burn calories definition in the English Cobuild dictionary for learners, to burn calories meaning explained, see also 'burn out',burn up',burn down',burn off', English vocabulary One calorie equals 4.18 joules; 1 joule equals 0.000239006 of a calorie. The use of the kilogram-calorie (kcal) for nutrition was introduced to the American public by Wilbur Olin Atwater, a professor at Wesleyan University, in 1887.[3]. (cal) A measure of heat energy representing the amount of heat needed to raise the temperature 1 g of water by 1°C. This answer is useful. noun plural -ries a unit of heat, equal to 4.1868 joules (International Table calorie): formerly defined as the quantity of heat required to raise the temperature of 1 gram of water by 1°C under standard conditions. ] the SI unit of energy is expressed 1 calorie definition 1000-calorie units known as kilocalories kilojoules officially! 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