标准煤——假想的煤标准煤是每公斤发热量达7000大卡的煤。卡,原是热量的基本单位,卡的1000倍为千卡或大卡。1大卡的热虽能使1公斤水升高1℃。然而我国现已实行的法定计量单位中,卡作为单位已被废除,所有能量、功和热均用焦耳作单位,焦耳称焦,焦的1000倍叫千焦,1大卡等于4.168千焦,标准煤用法定计量单位表示,是指 Standard coal - hypothetical coal Standard coal is 7,000 calories per kilogram of coal. The card, which was originally the basic unit of calories, was 1,000 times as large as a card or a large card. Although 1 kcal of heat can increase 1 kg of water by 1 °C. However, in the legal measurement unit that has been implemented in China, the card as a unit has been abolished, all the energy, power and heat are used Joules as the unit, Joule as the coke, 1000 times as the coke, and 1 kcal as 4.168 kJ. The use of standard coal in measurement units means that