Calorie
| Calorie (British thermal unit) | |
|---|---|
| Sign | Btu,BTU |
| System | The yard pound method |
| Quantity | Energy・Work・Heat capacity |
| SI | 1055.06 J (Japanese regulations of measurement) |
| Definition | Heat capacity necessary to raise temperature of the water of 1lb by 1 degree Fahrenheit |
A calorie (えいねつりょう, Btu,BTU, British thermal unit) is a credit of energy, work, the heat capacity of the yard pound method. I say Btu (えいこくねつりょうたんい), the English method thermal unit. I adopt the name of "the calorie" in the Japanese regulations of measurement (measurement unit law) [1].
Table of contents
Summary
I am used in the caloric whole including the gas stove other than an air-conditioning system mainly in the United States as far as they are used in the United States and the U.K., and air-conditioning systems were limited to in the U.K. (but it is correct because the numerical value to express the ability of these heat apparatuses is workrate in Btu/h (calorie every hour)). Even the business of natural resources varying in quantity of calorie is used by a unit such as MMBTU (1 million calories) worldwide by composition including natural gas.
As for the unit mark of the calorie, only Btu is determined in the Japanese regulations of measurement (measurement unit rule) [2].
The calorie is defined as heat capacity necessary to raise temperature of 1 pound of water by 1 degree by degree Fahrenheit. In other words, it may be said that I replaced the definition of the calorie with the unit of yard pound method. Because the specific heat of the water varies according to the temperature, as well as a calorie, various calories will exist as follows whether you define it with water of how many degrees. The difference is within about 0.5%.
| Name | Value (J) | Remarks |
|---|---|---|
| International steam list (IT) | ≡ 1055.055 852 62 | It is Btu used best. Exchanging an international steam list calorie (exactly 4.1868 J), and, in the fifth international steam applied meeting held in London in 1956, defined it with water of 14.5 degrees Celsius (58.1 degrees Fahrenheit). |
| Japanese regulations of measurement | ≡ 1055.06 | I rounded the value of the international steam list (IT) to two columns of decimals [3] |
| Legal value of the U.K. | ≡ 1055.055 852 573 48 | Value [4] in the British legality |
| 39 degrees Fahrenheit | ≈ 1059.67 | Value at the temperature (39.1–39.2 ° F) to become the maximum density of the water |
| Average | ≈ 1055.87 | A one-180th of the heat capacity necessary to raise temperature of the water from 32 degrees Fahrenheit (0 degrees Celsius) to 212 degrees Fahrenheit (100 degrees Celsius) |
| 59 degrees Fahrenheit | ≡ 1054.804 | I am mainly used in the United States. It is based on the definition of the 15 degrees calorie (defined as 4185.5 J exactly). |
| 60 degrees Fahrenheit | ≈ 1054.68 | I am mainly used in Canada. |
| Thermodynamics | ≡ 1054.35026444 | It is based on the definition of the thermodynamic calorie (exactly 4.184 J). 9489.152 380 4/9 |
Conversion of the unit
1 calorie is quite equivalent to the following values.
- 252-253 Cal.
- 778-782 feet of pound (ft·lbf) (feet, pound)
- 1054〜1060 Joule
- A 0.293071 watts hour (W·h) (watt, time)
In addition, in the case of natural gas, 1 1 million BTU is equivalent to 0.021 tons or 25m3 [5].
Derivation unit
(Btu/h) is a credit of workrate, the rate of production in calorie every hour. I show the workrate of 1 calorie an hour.
quad (abbreviation of quadrillion (1 quadrillion)) is defined as 1015 calories. 1 quad is approximately 1.055*1018 joule.
I define 100,000 calories as therm () in the United States of America and European Union. But I use BtuIT in Europe using Btu59 ° F in the United States. It is spent for the calculation units of gas rate and is quite equal to heat capacity that natural gas of 100 cubic feet (100ft3, approximately 2.7m3) burns in 1 term and occurs.
Quotation
- ^ [1] measurement unit law separate table Clause 7 turn 14 "heat capacity"
- Clause of the ^ [2] measurement unit rule separate table sixth "heat capacity"
- ^ [3] measurement unit law separate table Clause 7 turn 14 "heat capacity"
- ^ [4] The Units of Measurement Regulations 1995 No. 1804 SCHEDULE, column of Energy
- ^ http://www.tokyo-gas.co.jp/IR/library/pdf/investor/ig1000.pdfc Tokyo Gas
Outside link
This article is taken from the Japanese Wikipedia Calorie
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