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I disagree. Sometimes when you're trying to quantify something specific, it's best to use units that are topical. If you want to talk about how much CO₂ the pro
by acidburnNSA 4y ago
I disagree. Sometimes when you're trying to quantify something specific, it's best to use units that are topical. If you want to talk about how much CO₂ the production of a kWh of electricity (not heat) that different sources of electricity use, mass CO₂ per kWh electric generated is the most useful and intuitive unit. Differences in thermal efficiency, etc. do not matter if you're focused on getting a kWh-electric for the smallest amount of lifecycle CO₂. This is especially important when comparing non-thermal sources (hydro, wind, solar) alongside thermal sources.
- kragen 4y agothe difference between kilowatt hours per gram and joules per kilogram also does not matter if you're focused on getting a kilowatt hour electric for the smallest amount of lifecycle carbon dioxide; a kilowatt hour per gram is precisely 3.6 gigajoules per kilogram, nothing more, nothing less. the only benefit of using the 'topical' units is an unnecessary risk of calculation errors and other kinds of confusion this nonsense about topical units is the reason that medieval merchants would measure certain kinds of cloth in flemish ells of 27 inches and other kinds of cloth in english ells of 45 inches; silver was weighed in troy ounces of 480 grains, drugs were weighed in apothecaries' drams of 60 grains (or apothecaries' ounces, which were the same as troy ounces), and foods were weighed in drams of about 27.3 drams, or avoirdupois ounces of 437½ grains kilowatt hours and grams per kilowatt hour are the modern equivalent of apothecaries' drams
- kragen 4y agoexcuse me, avoirdupois drams are 27.3 grains, not 27.3 drams