Is the bulb of a thermometer made of a diathermic or adiabatic wall?

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(A) diathermic wall allows the exchange of heat between systems,whereas an adiabatic wall prevents the exchange of heat. For a thermometer to measure the temperature of a system,it must be in thermal equilibrium with that system. Therefore,the bulb of a thermometer must be made of a diathermic wall to allow heat transfer.

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