14.2.1—A physical property that varies with temperature may be used for the

A thermometric property varies with temperature and can be calibrated to provide a temperature reading; examples include liquid volume, resistance or thermocouple emf.

A useful property should be monotonic over the range, reproducible and sensitive enough to resolve the required temperature change.

The resistance of a platinum sensor can be calibrated against fixed points and then used to infer an unknown temperature.

A property changing with temperature is not automatically a good thermometer; calibration and response range are essential.