High School

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Water heated from below distributes the added heat by __________, whereas the still surface of water heated from above distributes the added heat by ________.

A) Convection; Conduction
B) Conduction; Convection
C) Radiation; Convection
D) Convection; Radiation

Answer :

Final answer:

The correct answer to the student's question is A) Convection; Conduction, as convection is driven by the movement of warmer fluid rising and cooler fluid sinking, while conduction involves transfer of heat through direct contact.

Explanation:

The question pertains to the mechanisms of heat transfer. Water heated from below distributes the added heat by convection, whereas the still surface of water heated from above distributes the added heat by conduction. Therefore, the correct answer is A) Convection; Conduction.

Convection involves the movement of mass, such as liquids or gases, whereby the warmer, less dense part of the fluid rises and the cooler, denser part descends, creating a current that redistributes the heat. In contrast, conduction is the transfer of heat through direct contact between molecules, which is the primary method of heat transfer when water is heated from above and the surface remains still since the fluid does not mix.

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