题目当中那个720C是720摄氏度吗?如果是的话,那这个减压的过程应该是一个绝热过程
所以 V^(1+2/f) * P = V^(1+2/f) * P 这里 V是体积,P是气压,f是气体分子自由度
氮气在720度的自由度是5,
所以
V^(7/5)*5.2 = 120^(7/5)*1.4 →→ V=19.11（liter）
答：初始体积为19.11升
what was the original volume of nitrogen if its initial pres
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