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What does it mean when we say that water acts as a “heat buffer”?

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What does it mean when we say that water acts as a “heat buffer”?

(a) It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates

(b) It increases the temperature of an organism as the temperature of the surroundings increases

(c) It decreases the temperature of an organism as the temperature of the surroundings increases

(d) It increases the temperature of an organism as the temperature of the surroundings decreases

I got this question by my school principal while I was bunking the class.

The query is from Tricky Questions and Answers topic in division Regulation of Gene Expression and Miscellaneous of Biochemistry

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Right choice is (a) It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates

The explanation: Water has a high specific heat capacity, it is hard to increase or decrease the water temperature which requires a lot of heat energy and therefore water acts as a heat buffer.

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