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乘飞机时会感觉到皮肤很干燥,也特别容易口渴,这些都是由机舱里的空调造成的.通常高空中的温度很低,达到摄氏零下几十度.但飞机上的空调却是制冷的.怎样解释高空中的气温和飞机空调的工作呢?一、热力学第一定律一个物体,如果它既没有吸收热量也没有放出热量,那么,外界对它做多少功,它的内能就增加多少.一个物体,如果它既没有对外做功,也没有其他物体对它做功,那么,它从外界吸收多少热量,它的内能就增加多少.如果外界既向物体传热又对物体做功,那么物体
When you fly, you will feel the skin is very dry and thirsty, which is caused by the air conditioning in the cabin. Usually the temperature in the sky is very low, reaching minus ten degrees Celsius, but the air conditioning in the aircraft is cooling. How do you explain the air temperature in high altitude and the work of aircraft air-conditioning? First, the first law of thermodynamics. If an object does not absorb heat or release heat, then how much the outside world does to it, its internal energy increases. How much. An object, if it does not do work outside, and there is no other object to do work on it, then how much heat it absorbs from the outside world, its internal energy will increase how much. If the external heat transfer to the object and do work on the object, then object