Question

Name a liquid which is a good conductor of heat.​

Answer 1

A liquid which is good conductor of heat is mercury

Answer 2

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Actually Welcome to the Concept of the Conductivity.

Since, we know that, Most of the thermometer (Physical) use the Mercury (Hg) as it's element to determine the temperature retained.

As the Nature of mercury such that,it is very much sensitive to the temperature around it and also it is liquid at the room temperature.

==> Hence, Mercury is a good conductor of heat.