To be able to compare the results to a sample without any of the independent variable added.
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hope this helps :)</span>
Atoms gain energy during evaporation and boiling
When a liquid begins to boil, it means its molecules and atoms are gaining increased kinetic energy and the molecules are getting further apart and the liquid is beginning to turn to gas.
Explanation:
Gas begins to form in the liquid and lift to the surface as bubbles and escaping into the atmosphere. The vapor pressure of the liquid also overcomes the atmospheric pressure in this stage allowing the change of phase. This can only occur as long as the molecules and atoms of the liquid continue to gain energy. This is the reason that even though you keep heating the liquid, it remains at its boiling point temperature as it changes phase. This energy is referred to as the latent heat of vaporization.
Learn More:
For more on latent energy of vaporization check out;
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Oak tree is an example of a biotic factor
