[問題] 一題熱力學觀念請教
題目如下:
Two equal quantities of water , each of mass m and at temperature T1 and T2,
are adiabatically mixed together , the pressure remaining constant.
Show that the entropy change of the universe is
ΔS=2mCp ln( (T1+T2) / (2(T1T2開根號)))
我有算出來 但我對觀念部分有點疑慮
在這裡是求ΔS universe
ΔS universe = ΔS system + ΔS surrounding
我的想法是:
因為絕熱 所以ΔS surrounding=0
而ΔS system=不可逆ΔS (如答案所示)
假如系統可逆的話 ΔS system = dQ/T
是這樣嗎?
總覺得怪怪的 想上來確定一下觀念是否正確 感謝!
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