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The Q in the enthalpy of fusion equation stands for heat energy absorbed or released.
<h3>What is enthalpy?</h3>
In thermodynamics, enthalpy is a measure of the heat content of a chemical or physical system.
The enthalpy of fusion is the amount of heat energy required to convert a unit mass of a solid at its melting point into a liquid without an increase in temperature.
Its units are usually Joules per gram (J/g) or calories per gram (cal/g).
The enthalpy of fusion equation is given as follows:
Q = m·ΔHf
Where;
- Q = heat energy
- m = mass
- ΔHf = heat of fusion
Therefore, the Q in the enthalpy of fusion equation stands for heat energy absorbed or released.
Learn more about enthalpy of fusion at: brainly.com/question/20897184
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The body of a porter carrying load on head on a level road uses more energy than is required when the porter is resting completely. In this way the porter is doing some work.
However, when we think of theoretical definition of work, there is no force resisting the horizontal movement of the load when carried on a level road, and therefore there is no work done when a porter carrying a load on his head walk along a level road.
When the porter is going down the stairs the gravitational energy acting on the load is assisting the downward movement of the load. In this way energy is released by downward movement of the load. Thus the porter is doing negative work on the load.
