How heat can be
added to a system? explain with example
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The first law of thermodynamics relates changes in internal energy to heat added to a system and the work done by a system. ... q is positive if heat is added to the system, and negative if heat is removed; w is positive if work is done by the system, and negative if work is done on the system.
For example, the temperature of a cup of coffee may feel hot if you put your hand around it. it is hot because heat from the coffee is transferred to the cup.
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