Talk:British thermal unit

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ISO Btu value

@Easchiff: Apparently you changed the ISO Btu value from 1055.056 to 1055.06, based on a table given in a book. I don't have access to the ISO standards, but it seems it doesn't say either 1055.06 or ≡, it possibly says instead: 1 Btu = 778.169 ft･lbf ≈ 1 055.056 J (https://ja.wikipedia.org/wiki/ISO_80000-5, 788 must be a typo for 778). Jellby (talk) 09:08, 1 September 2019 (UTC)[reply]

US policy section removed

I removed the following recently added paragraph:

Government policy in the United States, as stated by law, is to phase out imperial and US customary unit and replace them with metric equivalents.^[1] As of 2018, the metric system is mandatory to use in trade and commerce in all countries except the United States, Myanmar and Liberia.^[2]

This article is to about US metric policy and the paragraph is somewhat misleading in that there is little active effort in the US to replace then use of BTU and other customary units. See Metrication in the United States.--agr (talk) 16:06, 3 November 2019 (UTC)[reply]

References

^ "US 1988 law on metrification". Retrieved 2019-09-21.
^ "Countries not using SI". Retrieved 2019-09-21.

Conversion template

As of right now the unit conversion template gives different values for 1,000 British thermal units per pound (2,300 kJ/kg) and 1,000 British thermal units per pound (2,300 kJ/kg) while describing both units as "British Thermal Units". Is there some method to the madness or does the code need fixing? Hobbitschuster (talk) 13:33, 23 June 2022 (UTC)[reply]

I agree, something's broken. I suggest you bring it up on Template talk:Convert - the maintainers there will be able to track down the problem. Indefatigable (talk) 14:50, 23 June 2022 (UTC)[reply]

International watt-hour vs modern watt-hour?

The article states "860 "IT" calories corresponded to exactly 1 international watt-hour (not the same as a modern watt-hour)."

What exactly is the difference between the two? The watt-hour page (redirects to kilowatt-hour) has no mention of this. Can a source be cited? 163.116.249.34 (talk) 15:06, 2 November 2022 (UTC)[reply]

The second paragraph of Watt#Origin and adoption as an SI unit describes a change in definition. In addition to those references, I find British Standard BS 350 : Part 1: 1974 Conversion values and tables has concerning the joule "This unit was, prior to the SI, known as thc absolute joule, but it is now simply the joule (J). The ' intemstional ' joule, which becamc obsolete in 1948, was approximately equal to 1.000 19 J." NebY (talk) 16:35, 2 November 2022 (UTC)[reply]

Thank you for the explanation. I've changed "international watt-hour" in this article to link to the section of the Watt page you referenced, since it explains the difference between the two. 163.116.249.47 (talk) 17:05, 2 November 2022 (UTC)[reply]

Good thinking, thanks! NebY (talk) 17:06, 2 November 2022 (UTC)[reply]

[1] "US 1988 law on metrification". Retrieved 2019-09-21.

[2] "Countries not using SI". Retrieved 2019-09-21.

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