(c) Temperature is measured directly in a coffee-cup calorimeter.
A coffee cup calorimeter:
It is essentially a polystyrene (Styrofoam) cup with a lid. The cup is partially filled with a known volume of water and a thermometer is inserted through the lid of the cup so that its bulb is below the water surface.
Out of the given options,
Temperature is measured directly in a coffee-cup calorimeter.
Thus, option C is correct.
Find more information about Calorimeter here:
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