The best conductor of heat among the following is ________.

alcohol

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mercury

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ether

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water

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Solution

The correct option is B mercury
Rate of heat flow, $\frac{Q}{t} = \frac{k A Δ T}{l}$ , where $k$ is thermal conductivity, $A$ is the cross-sectional area of material, $l$ is the length of the material.
So higher the thermal conductivity, higher is the rate of heat flow.

Mercury has the highest thermal conductivity of $8.30 W / (m - K)$ among given options, so it is the best conductor of heat.

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Similar questions

Which among the following is the best conductor of heat?

Give an example of a metal which:

(a)
Is a liquid at room temperature?

(b)
Can be easily cut with a knife?

(c)
Is the best conductor of heat?

(d)
Is a poor conductor of heat?

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