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Brian is heating some water in a pot without a lid. As time passes, he notices the water level is getting lower and lower. What describes the reason for Brian's observation?

A. Heat is escaping through the top of the pot because it is not covered.
B. The heat is causing the water particles to contract and take up less space.
C. The impurities in the water are entering the gas phase, leaving pure water behind.
D. The particles making up liquid water are entering the gas phase.



Answer :

GinnyAnswer

Final answer:

Evaporation and vapor pressure cause the water level to decrease in the uncovered pot, while convection redistributes heat within the water.


Explanation:

Evaporation is causing the water level to decrease in the pot without a lid. When the water is heated, some of its molecules gain enough energy to escape into the gaseous phase, leading to a decrease in water level over time.

Vapor pressure plays a role in this process, as the escaping water molecules generate a pressure above the liquid's surface, contributing to the water loss in the uncovered pot.

Additionally, the convection within the heated water redistributes heat, causing warmer water to rise and colder water to sink, contributing to the overall water level change.


Learn more about Evaporation and its effects on water level here:

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