 |
Business | Industries | Finance | Tax |
| Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
|
|||||
| First Prev [ 1 2 ] Next Last |
The slight variations in these units can be seen if you convert them to joules. For example, one 15 °C calorie is the amount of heat necessary to raise the temperature of 1 g of water from 14.5 °C to 15.5 °C. This is approximately equal to 4.1855 J or 3.968×10-3 Btu. The International Steam Table calorie is approximately equal to 4.1868 J and the thermochemical calorie 4.184 J.
Of these various units, what is most commonly meant by calorie in contemporary English text is the 15 °C calorie.
Since this could be a source of confusion and error, these units are now deprecated. The International System of Units (SI) unit for heat (and for all other forms of energy) is the joule (J), while the (obsolete) cgs system uses the ergAn erg is the unit of energy in the centimetre-gram-second ( CGS) system of units, symbol "erg". The erg is a quite small unit, equal to 1 × 10-7 joules. It is thus equal to one gram· centimetre2/ second2. Erg is also a common name for an indoor rower, pa.
Nutritionists, when describing the energy content of food, typically refer to Calories (capitalized and abbreviated as C); one food Calorie equals 1000 calories (the 15 °C variety), or about 4,186 JTo help compare different orders of magnitude this page lists energies between 1,000 joules and 10,000 joules. Weaker energies 1,000 J Energy stored in a typical photography studio strobe unit 1,055 J 1 British thermal unit 1,360 J energy received from th. A food calorie is more precisely abbreviated as kKilo (symbol: k is a prefix in the SI system denoting 103 or 1,000. For example: kilogram is 1000 grams kilometre is 1000 metres kilowatt is 1000 watts kilojoule is 1000 joules Adopted in 1795, it comes from the Greek , meaning thousand''. Kilo" is oftencal for kilocalorie.
This situation provides two ways of talking about the amount of calories in food which look quite different but that express the exact same amount of energy. One may say that dietary fatThis article is about lipid molecules, for FAT see File Allocation Table. In biochemistry, fat is a generic term for a class of lipids. Fats are produced by organic processes in animals and plants. All fats are insoluble in water and have a density signif has 9 kcal per gram, while proteinmyoglobin, showing coloured alpha helices. This protein was the first to have its structure solved by X-ray crystallography by Max Perutz and Sir John Cowdery Kendrew in 1958, which led to them receiving a Nobel Prize in Chemistry. A protein is a complex,s and carbohydrates have 4 kcal per gram, or, one may say that fat has 9 Calories per gram while carbohydrates and proteins have 4 Calories per gram.
This thousand-fold difference has led to a joking calculation, sometimes taken seriously, which "shows" that warming cold beer (or ice cream) in the stomach requires more energy than present in the refreshment, and thus a cold beer or a frozen dessert can be used to lose weight. The error lies in the conversion of nutritional beer Calories to thermochemical calories on a one-to-one basis instead of properly converting a food Calorie to a thousand thermochemical calories. Once that mistake is corrected, it becomes clear that cold or even frozen beer contains much more nutritional energy than required to warm it to body temperature.
(see Beer and Ice Cream Diet)
| Politics | Business | Finance |
 |
 |
 |
|