calorimeter
Concise Oxford English Dictionary © 2008 Oxford University Press:
calorimeter /ˌkaləˈrɪmɪtə/
▶noun an apparatus for measuring the amount of heat involved in a chemical reaction or other process.
– derivatives
calorimetric adjective,
calorimetry noun.
calorimetric adjective,
calorimetry noun.
'calorimeter' also found in these Oxford entries:

