Thursday, March 25, 2010

Thermal equilbrium

In winter, due to coolness, our body rises its temperature mean while in summer, due to hotness,
our body lows its temperature, whatever may be, our body is main tool to maintain thermal equilbrium in order to protect itself.
Here we discuss about the term 'temperature', in order to understand this term we have to know about zeroth law of thermodynamics.
Suppose if two bodies are in thermal equilbrium, then it is difficult to measure the heatness of the bodies, so that we have to take another body to keep in contact with that bodies in order to measure its heatness. Like that, the term we used to measure is temperature i.e., it is that inner property of heat of a body when a body is in contact with another body to take it to thermal equilbrium.
Clearly, we say that 'temperature' characterises the thermal equilbrium of the system of bodies, i.e., temperature is a property which denotes when the system is equilbrium or not.
For example, when we measure the temperature of a person who has suffered from fever, we keep the thermometer in his mouth, whenever mercury in thermometer is thermally equilbrium with the heatness of the body, thermometer indicates some reading which tells thermal equity value i.e., the temperature of the body of the person.
"When two bodies A and B are individually thermal equilbrium with another body C, then automatically bodies A and B are become thermally equilbrium with each other."
This is called zeroth law of thermodynamics.

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