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What is the definition of a thermometer? a) An instrument used to measure the temperature of an object or system in thermal equilibrium with the th...

What is the definition of a thermometer?
a) An instrument used to measure the temperature of an object or system in thermal equilibrium with the thermometer.
b) An instrument used to measure the amount of energy in a substance.
c) An instrument used to transfer energy from one substance to another.

a) a
b) b
c) c