On 10 January 2014 11:24, David de Jongh <[email protected]> wrote: > 1 Therm = 100,000 Btu (nominally)
Gas for heating and cooking is sold in the UK and US in Therms, and in many countries in cubic metres or cubic feet. The notion of selling fuel gas by the therm allows for different energy content, which variance was much more significant when gas was manufactured from coal, and contained mostly hydrogen, carbon monoxide, and carbon dioxide. Now that's it's virtually all natural gas from the ground, which is 90+% methane, it's pretty standard. Here in Ontario, my gas bill shows usage in cubic metres, but there is an adjustment factor for the heat content, which hasn't changed for years. Tony H.
