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1st law of thermodynamics It states, energy can neither be created nor be destroyed. The total energy of universe remains constant. Last Updated: Friday, October 23, 2009

Zeroth Law of Thermodynamics Two bodies are said to be in thermal equilibrium if no transfer of heat takes place when they are placed in contact. We can now state the Zeroth law of thermodynamics as follows: If two bodies … Continued

Hot and Cold Bodies When we rub our hands for some time, they become warm. When a block slides on a rough surface, it becomes warm. Press against a rapidly spinning wheel. The wheel slows down and becomes warm. While … Continued

Important Terms and Definitions 1. System: A portion of universe which is under investigation, e.g., portion of test tube where reaction is taking place, is called system. Last Updated: Friday, October 23, 2009