Change of temperature.ppt

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An office worker claims that a cup of cold coffee on his table warmed up to 80̊̊̊̊̊̊̊̊̊̊̊̊̊̊°C by picking up energy from the surrounding air, which is at 25̊̊̊̊̊̊̊̊̊̊̊̊̊̊°C. Is there any truth to his claim? Does this process violate any thermodynamics law?

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Change of temperature.ppt

  1. 1. APPLIED THERMODYNAMICS 1 PRESENTATION 01 AKASH Thahrani
  2. 2. An office worker claims that a cup of cold coffee on his table warmed up to 80̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊°C by picking up energy from the surrounding air, which is at 25̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊̊°C. Is there any truth to his claim? Does this process violate any thermodynamics law?
  3. 3.  Everything is mentioned over here that, A cold cup of coffee on a table and the surrounding air temperature is 25°C.  Coffee does get hot up to 80°C getting energy from surrounding while surrounding temperature is 25°C.  CLAIMS: Obviously this is impossible to cause heat flow from surrounding at 25°C rather coffee become warmed up to 80°C.
  4. 4.  Truth:  The truth is that heat flow from surrounding to coffee until up to that quantity both temperature conserves than 2nd law of thermodynamics does go pass. Violation of thermodynamics: There is violation/ fail of 2nd law of thermodynamics, which says that; It contains two statements, if single state go fail obviously 2nd law will become violate.
  5. 5.  Statement of 2nd law of thermodynamics: i. Celsius statement; “It is impossible to cause heat flow from cold body to hot body without the expenditure of energy” OR “It is impossible to drive a continuous supply of work by cooling a body to a temperature lower then that the coldest of its surrounding”
  6. 6.  Example: In refrigerator temperature is very low, it convert the hotness to coldness if we open the refrigerator, it won’t maintain. ii. Kelvin statement: If we construct a heat engine which can work containing without sink. Here law of conservation of energy and 2nd law of thermodynamics fail/ violate/ equilibrium state does not maintain.

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