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#2
Thursday, February 16, 2012
 azeegum Senior Member Join Date: Nov 2009 Location: Karachi Posts: 432 Thanks: 412 Thanked 359 Times in 196 Posts
Heat and temperature are not the same thing!

Quote:
 Originally Posted by Da Skeptic Generally, textbooks in Pakistan define Heat and Temperature in a confusing and incomplete way.. The standard definitions of the two are as under.. Heat: The total kinetic energy of the molecules of a system is called as Heat.. Temperature: The average kinetic energy of the molecules of a system is called as Temperature.. As compared to a Sea, a cup of Hot Tea has seems to have more heat.. But actually, the sea has more heat than a cup of hot tea.. as the total kinetic energy of the molecules of the sea will be far greater than the total kinetic energy of the molecules of tea.. whereas the average kinetic energy of the molecules of a cup of hot tea is greater than the average kinetic energy of the molecules of the sea.. so the sea has more heat but less temperature as compared to a cup of hot tea..
I guess bro, you forgot to add something to the definition of temperature . You have elaborated the difference with the example of hot tea and sea quite correctly, but your definition (of temperature) does not conform to it. I think it might be a typo but it makes a big difference. Anyways!
According to your definitions, heat and temperature prove to be the same thing ( ie energy ) in this or that way. Heat and temperature are not the same thing. It's not the average and total kinetic energy of a system that differentiates both. In fact, temperature in itself is not energy at all. Temperature is just a number or measure that is used to determine the average kinetic energy of a system, not a kind of energy in itself. You can say that the average kinetic energy of molecules of a substance is proportional to temperature. The correct definition of both go as:

Heat:
Total kinetic energy of molecules of a substance or system etc is heat.
Temperature:
Temperature is a degree, or number or measure etc to determine the average kinetic energy of a substance or system etc.
OR

The average kinetic energy of molecules of a substance determines the temperature of a substance or a system etc.

To tell more about heat, the heat capacity of a substance depends on the three things
1. its temperature
2. the amount of matter it contains
3. the kind of matter it is made of

Moreover, we have different units of measurement for both heat and temperature. Heat is measured in joules or kilojoules, calories etc. Temperature is measured in Celsius, Fahrenheit, and Kelvin.
So both are inter-related but not identical.
In short, basically, heat is energy and temperature a measure to determine that energy.

Regards
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 The Following 3 Users Say Thank You to azeegum For This Useful Post: azure (Thursday, February 16, 2012), tyre (Friday, February 17, 2012), Umm e Farwa (Saturday, February 18, 2012)