We feel comfortable under a fan when we are perspiring because the fan actually increases the rate of evaporation of sweat. This means that the perspiration (or sweat) evaporates more quickly when we are under a fan, which also means that our body feels cooled and comfortable because of the lack of sweat.
The answer would be Geothermal Because it uses the surroundings to cycle the energy into different types of thermal energy.
Taking into account the definition of dilution, moles of solute (option C) is the only thing about the solution that does NOT change.
<h3>Dilution</h3>
When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
- Ci: initial concentration
- Vi: initial volume
- Cf: final concentration
- Vf: final volume
<h3>Summary</h3>
In summary, moles of solute (option C) is the only thing about the solution that does NOT change.
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