Respuesta :
When a substance changes state from liquid to a gas the atoms of the substance separate from each other. The gap between the atoms increase in gaseous state than liquid state. The atoms move randomly in gaseous state. The entropy increase.
Condensation is the process by which, the physical state of a substance changes from its gas phase to the liquid phase. It can also be defined as the transition of water vapor into water droplets, upon contacting a solid surface. This process is useful in separating solute and solvents from their solution. The solution is heated, making the solvent evaporate, which is then collected separately upon condensation
A gas has more heat energy, often called thermal energy, than a liquid, even if both the liquid and gas are at the same temperature. Consider that the gas molecules have more thermal energy than liquid molecules of that same substance. The gas molecules are "free" to move around more because they have more kinetic energy than molecules of the liquid. And kinetic energy is function of thermal energy.
If we consider the case of water molecules to illustrate our point, when a pan of water is boiling, the water molecules escaping the pan as a gas have more kinetic energy than the ones making up the liquid water that is still in the pan. Also consider the case of water that is evaporating. Wet your finger and blow on it. The liquid water on your finger cools as the evaporating water molecules take thermal energy from that liquid to make their change of state possible. It takes an increase of thermal (heat) energy to change a liquid into a gas.
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