Editing British thermal unit (section)

== Conversions ==
One Btu is approximately:
* {{cvt|1.0000|Btu|kJ|disp=out}} ([[joule|kilojoule]]s)
* {{cvt|1.0000|Btu|W.h|disp=out}} ([[Kilowatt hour|watt hours]])
* {{cvt|1.0000|Btu|cal|disp=out}} ([[calorie]]s)
* {{cvt|1.0000|Btu|kcal|disp=out}} (kilocalories)
* 25,031 to 25,160&nbsp;ft⋅pdl ([[foot-poundal]])
* {{cvt|1.0000|Btu|ft.lbf|disp=out}} ([[foot-pound (energy)|foot-pounds-force]])
* 5.40395 (lbf/in<sup>2</sup>)⋅ft<sup>3</sup>

A Btu can be approximated as the heat produced by burning a single wooden kitchen match or as the amount of energy it takes to lift a {{convert|1|lb|spell=in|adj=on}} weight {{Convert|778|ft|m|0}}.<ref name="RistinenKraushaar2006">{{cite book|last1=Ristinen|first1=Robert A. |last2=Kraushaar|first2=Jack J. |title=Energy and the Environment|url=https://archive.org/details/energyenvironmen00rist|url-access=registration|year=2006|publisher=John Wiley & Sons|isbn=978-0-471-73989-0|pages=[https://archive.org/details/energyenvironmen00rist/page/13 13]–14}}</ref>

=== For natural gas ===
{{main|Natural gas prices}}
* In [[natural gas]] pricing, the Canadian definition is that {{val|1000000|u=Btu|fmt=commas}} ≡ {{val|1.054615|u=GJ}}.<ref name=Alberta>{{cite web | url=http://www.energy.gov.ab.ca/about_us/1132.asp | title=Energy Measurements | access-date=7 January 2017 | publisher=Government of Alberta Province | url-status=dead | archive-url=https://web.archive.org/web/20170120191331/http://www.energy.gov.ab.ca/About_Us/1132.asp | archive-date=20 January 2017 | df=dmy-all }}</ref>
* The energy content (high or low heating value) of a volume of natural gas varies with the composition of the natural gas, which means there is no universal conversion factor for energy to volume. {{convert|1|ft3|L|abbr=off}} of average natural gas yields ≈ 1,030&nbsp;Btu (between 1,010&nbsp;Btu and 1,070&nbsp;Btu, depending on quality, when burned)
* As a coarse approximation, {{convert|1000|ft3|m3}} of natural gas yields ≈ {{val|1000000|u=Btu|fmt=commas}} ≈ {{val|1|u=GJ}}.
* For natural gas price conversion {{val|1000|u=m3|fmt=commas}} ≈ 36.9&nbsp;million&nbsp;Btu and {{val|1000000|u=Btu|fmt=commas}} ≈ {{val|27.1|u=m3}}

===Btu/h===
The SI unit of [[Power (physics)|power]] for heating and cooling systems is the [[watt]]. Btu ''per hour'' (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu".<ref>{{cite book|title=Masonry Heaters: Designing, Building, and Living with a Piece of the Sun|author=Ken Matesz|page=148|publisher=Chelsea Green Publishing|year=2010}}</ref> ''MBH''—thousands of Btu per hour—is also common.<ref>{{Cite book |last=Arimes |first=Tom |oclc=32314774 |title=HVAC and chemical resistance handbook for the engineer and architect : a compilation |publisher=BCT |year=1994 |isbn=0-9640967-0-6 |location=Lexington, Ky. |page=11-12 }}</ref>

* 1 W is approximately {{convert|1|W|Btu/h|disp=out|sigfig=7}}<ref>{{cite web|url=http://app.knovel.com/web/toc.v/cid:kpASHRAE22/viewerType:toc/root_slug:ashrae-handbook-fundamentals/url_slug:ashrae-handbook-fundamentals/|title=2009 ASHRAE Handbook – Fundamentals (I-P Edition)|url-status=live|archive-url=https://web.archive.org/web/20151017172515/http://app.knovel.com/web/toc.v/cid:kpASHRAE22/viewerType:toc/root_slug:ashrae-handbook-fundamentals/url_slug:ashrae-handbook-fundamentals/|archive-date=17 October 2015|access-date=21 September 2015|publisher=[[ASHRAE|American Society of Heating, Refrigerating and Air-Conditioning Engineers]], Inc}}</ref>
* 1,000 Btu/h is approximately {{convert|1000|Btu/h|kW|disp=out|sigfig=4}}
* 1&nbsp;hp is approximately {{convert|1|hp|Btu/h|disp=out|sigfig=4}}