[問題] 超流體噴泉如何不產生永動機矛盾?
看了液氦的超流體噴泉實驗
突然想到,這如何理解,才不致使這系統變成永動機迷思?
還是噴泉會損失怎樣的能量? 使怎樣的能量轉換成重力位能?
還是這重力位能是無法被使用的?
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