熵1:物理学上指热能除以温度所得的商,标志热量转化为功的程度。
2: 科学技术上用来描述、表征系统不确定程度的函数。
亦被社会科学用以借喻人类社会某些状态的程度。
3:传播学中表示一种情境的不确定性和无组织性。
英文释义:The degree of randomness or disorder in a thermodynamic system.[1]
1.熵是体系的状态函数,其值与达到状态的过程无关;
2.熵的定义式是:dS=dQ/T,因此计算某一过程的熵变时,必须用与这个过程的始态和终态相同的过程的热效应dQ来计算。
(注:如果这里dQ写为dQR则表示可逆过程热效应,R为reversible;dQ写为dQI为不可逆过程的热效应,I为Irreversible。
)
3.TdS的量纲是能量,而T是强度性质,因此S是广度性质。
计算时,必须考虑体系的质量;
4.同状态函数U和H一样,一般只计算熵的变化。my memory is very超级紧急英语初二作文60词
My best memory is from childhood. We used to live in a trailer (haha) and it was at the bottom of a hill. I was probably about five and my brother was three (the littlest was not born yet). Whenever it would rain, our yard would literally fill up like a pool. My mom would put us in our trashiest clothes and call the neighbor kids (who we were all very close to) and we would set up the slide and play in the rain for as long as we could without getting cold. It was an amazing time and I remember it so fondly. My mom was right out there with us. She was a great, involved mother. But just the randomness of being allowed to play in the rain with my friends was so awesome.
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