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["Flujo",

2019-10-02View Original

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"¿Por qué la el flujo expansivo la temperatura disminmin",
Reply #22019-10-02
"Esta pregunta debería ser serser un resultado de conversión转化能。有一个实验,一个打气筒,活塞在起始点做标记,然后施加外力使活塞向下压缩气体,当压力上升时,同时产生热。一部分压力能转换为热能。因为产生的这部分热被大气吸收了一部分。当你恢复施加在活塞上的力后,活塞就不能回到原来的起始点了。如果是气筒在压缩时,与外界绝对的绝热,也就是说能量没有被损失,是一种理想的状况下,活塞即会回到原来的起始点。 这个实验说明了一点,就是能量的转换。比如你说的一种现象,如,氧气瓶。你若把它开大到一定时间,瓶嘴上即会产生冰霜。原因就在于此。因为气瓶在充装时是会产生热的。这部分热被大气吸收使瓶子内外温度相等。当把这部分气体释放到大气中它本身就会要有热量补充失去的那部分。所以就表现为温度降低了。其实就是一种热量转换。请注意热量与温度的概念。这个有一种概念的解释名词叫做熵、焓。关于这方面的能量转换原理,参照一种设备叫膨胀机。",
Reply #32019-10-02
"Veamos la膨胀机吧,讲的特别清楚"

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