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Isn't the word "burning" in the second sentence misleading, since burning is always a process with an efficiency less than 100%, while the Therm's 100,000 Btu value is theoretical, i.e., it assumes 100% efficiency?
"The therm (EC) is often used by engineers within the US." - Not sure if this the exact value used in the gas industry - the NYMEX conversion calculator (www.nymex.com) uses 1 therm = 105,505,600 J, which is one more d.p. than the EU definition.
212.21.109.30
- Clearly the NYMEX value is the Therm (UK), rounded.
- Urhixidur 17:01, 19 December 2005 (UTC)
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IT or ISO
editAccording to British thermal unit
1 BtuIT ≡ 1055.05585262 J and 1 BtuISO ≡ 1055.056 J
This article says
- 1 thm (EC) = 100,000 BtuIT = 105,505,600 J
Something's got muddled. Jimp 07:04, 5 December 2007 (UTC)
My calculations are as follows:
- 100,000 BtuIT = 100000 * 1055.05585262 = 105,505,585.262 J
- 100,000 BtuISO = 100000 * 1055.056 = 105,505,600 J
Hmm, must be a "switcheroo".
Carbon Footprint?
editThis article is about a unit of measurement. The inclusion of a section on the "carbon footprint" of natural gas seems irrelevant to the topic. Such a section should be found on the page for Natural Gas, not a unit of measurement. — Preceding unsigned comment added by 67.78.26.114 (talk) 15:18, 28 May 2012 (UTC)
symbol
editIn the lead the symbol thm is used, but later in the article the symbols Dth and MDth. Is this really correct? Ulflund (talk) 14:07, 9 August 2012 (UTC)
Definition of 'Buring 100 cubic feet of Natural Gas'
editIn the definition of a therm , is the abbrviation of 100 Cubic Feet of Natural Gas, and the Heat value, that is derived, by that consumption of Gas.
The original (As of this date), had the text 'and is commonly called 1 CF', or similar. This statment is nullified by further elements in the text , re the deffinition of what is a Hundred Cubic Feet , a measure that is commonly used in US Gas meters, is CCFs, which brakes doen to 'C' for the abbreviation of Centa, and 'CF' for Cubic Feet. This measure was used in Canada prior to the conversion from Imperial Units, to the SI system of measurement in the 1970's. (now Canadians get 454 grams of Ground Beef in the Store, and 380 mL of a Jar of Pickles, but I digress.) Richard416282 (talk) 17:03, 3 November 2012 (UTC)
Heat Content
editWith regard to the statement: "The heat content of natural gas is solely dependent on the composition of the gas, and is independent of temperature and pressure." The thermal energy released by combustion will be a factor of the temperature and pressure, and thus the total moles per unit volume. I think what the author meant was that gas metering is 'corrected' for ambient deviation from STP, in a way which normalizes the energy content.. but as written it's just factually incorrect. Matthias Alexander Jude Shapiro (talk) 21:15, 16 November 2017 (UTC)