Ncert Exercises & Solutions

Why does a metal bar appear hotter than a wooden bar at the same temperature? Equivalently it also appears cooler than wooden bar if they are both colder than room temperature.

Hint: The degree of hotness or coldness depends on the conductivity of the material.

Step 1: Find the comparative conductivity of the metal bar and wooden bar.

Due to the difference in conductivity, metals having high conductivity compared to wood. On touch with a finger, heat flows faster to the finger from metals and so one feels the heat. Similarly, when one touches a cold metal the heat from the finger flows away to the metal bar faster.

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