(C) Perspiration involves the exchange of heat from the body to the surroundings. Water absorbs latent heat from the body to undergo phase change from

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(C) Perspiration involves the exchange of heat from the body to the surroundings. Water absorbs latent heat from the body to undergo phase change from liquid to vapour. This process removes thermal energy from the skin,causing the body to cool down. Emissivity is a property of the surface material. $A$ thin layer of water on the skin does not enhance its emissivity; in fact,it does not significantly change the emissivity of the skin in the context of cooling. Therefore,the Assertion is correct,but the Reason is incorrect.

Class 11 Physics 1 Thermal Properties of Matter: Thermometry, Expansion and Calorimetry Latent Heat and Heating Curve

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$Assertion :$ Perspiration from the human body helps in cooling the body.
$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

AIIMS 2006 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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1 Thermal Properties of Matter: Thermometry, Expansion and Calorimetry

Subtopic

Latent Heat and Heating Curve

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$Assertion :$ Perspiration from the human body helps in cooling the body.$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.

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$A$ solid cube having certain fixed melting and boiling points takes heat from some source. The variation of temperature $\theta$ of the cube with the heat supplied $Q$ is shown in the adjoining graph. The portion $BC$ of the graph represents the conversion of

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$Assertion :$ Perspiration from the human body helps in cooling the body.
$Reason :$ $A$ thin layer of water on the skin enhances its emissivity.