Explain how mass and energy are conserved when water evaporates.
Answer (3)
The water molecules that are evaporationg absorb heat energy from the surrounding environment, which causes the evaporation. If 5 grams of water evaporate, then there will be 5 grams of water vapor in the air.
When water evaporates , the overall mass and quantity of water molecules remain same; the molecules are just dispersed across a larger area. Water molecules move more quickly when it evaporates thanks to energy from nearby waters, but the overall amount of energy is unchanged.
How does the evaporation of water maintain mass?
However, the conservation of mass law only applies to closed systems, in which cannot enter or exit. The container containing the water and the water vapor will thus have the same mass before, during, and after evaporation if you allow water to evaporate inside a sealed container.
Because energy is transformed rather than generated or lost, we refer to it as being conserved. Some of the heat energy in the air is transformed into the kinetic energy of the water molecules during evaporation, causing them to accelerate and turn into vapor.
Molecules acquire sufficient thermal energy during evaporation to break off from the liquid surface and enter the atmosphere as water vapor.
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When water evaporates, mass is conserved because the number of molecules remains the same, simply spreading into vapor. Energy is conserved through transformations, where heat energy is absorbed by water molecules, allowing them to escape as vapor. Overall, both mass and energy balance out in a closed system during evaporation.
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