[問題] Basic Concepts of Thermodynamics
Q:
An office worker claims that a cup of cold coffee on
his table warmed up to 80°C by picking up energy from the
surrounding air, which is at 25°C. Is there any truth to his
claim? Does this process violate any thermodynamic laws?
Ans:
我看到有兩派說法,不知道哪個說法較貼切題義。
a.)
Second law of thermodynamics
系統內終究會達到溫度平衡,
如果杯子內的咖啡是冷的,再較冷的環境,
較高的溫度會傳向較低溫的環境,
這狀態平衡將會是25度的環境空氣。
b.)
Thermodynamics Law - zero law
這定律說明熱永遠都是由高溫傳向低溫
問題
1.這題"table warmed up to 80°C"這是說桌子有80度嗎?
咖啡是冷的,環境氣體溫度25度
2.熱力學第二定律,應該是判斷熱力過程方向,及兩個假說,
與本題有相關嗎?
3.熱力學第零定律,這不是溫度計定律,請問熱是由高溫傳向低溫
這是哪一個熱力學定律?
4.我覺得本題主要觀念是熱平衡吧,應該只要以熱平衡解釋,
有需要引述哪一個熱力學定律嗎?
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