一个电热水器的标准效率标注为90%（即每消耗10千焦电,9千焦去加热水了）.如果热水器一般将水从20℃(68℉)的环境温度加热到80℃(176℉),其第二定律效率是多少（即,一台理想的热水泵做同样的工作时使用的能量对实际消耗的能量的比率是多少）?
一道环境化学题（英语的）An electric hot-water heater has a standard effi
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