Unit of heat in SI system is________________?
Correct answer: A. J
- A. J
- B. KCaL
- C. Cal
- D. GJ
Explanation
The SI unit of heat is the joule, written J, because heat is a form of energy and the SI unit of energy is the joule. Cal and kcal are non-SI calorie units, so students commonly choose Cal when they confuse nutritional or older heat units with the SI unit.
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About System, Surroundings and State Functions
A system is the part of the universe under study, while everything outside it is the surroundings; the boundary separates them. State functions such as pressure, temperature, volume, internal energy and enthalpy depend only on the state, unlike heat and work, which depend on the path taken.
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