在冬天,一个城市产生的热量可以与太阳提供的热量相等,甚至超过这一数值。
In winter the heat produced by a city can equal or surpass the amount of heat available from the Sun.
甚至在南极,夏至那天从太阳吸收的辐射热,也与互相间隔五英尺的一千瓦电炉组成的电炉网所放出的热量相等。
Even at the South Pole the radiation received from the sun at Midsummer's day equals the heat from a network of one-kilowatt electric fires, spaced five feet apart.
现代食物的生产消耗了过多的能量以至于在里程数相等的情况下,提供一个人足够的热量走到商店比开车前往的碳排放量更大。
Food production is now so energy-intensive that more carbon is emitted providing a person with enough calories to walk to the shops than a car would emit over the same distance.
OK, so that means heat is being imparted to the system, right, from the surroundings in a manner that compensates exactly the amount of work done.
好,这表示系统,从外界吸热,吸收的热量与系统,对外做功的值相等。
It makes sense, right, because you know we got less work out and delta u is the same right, so it must be that less heat got transferred.
这是显而易见的,因为输出的功更少,且Δu相等,所以需要的热量更少。
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