The thermometer whose reading is indicated by a change in color of its thermometric property is the?
- bi-metalic strip thermometer
- thermocouple
- platinium resistance thermometer
-
optical pyrometer
The correct answer is: D
Explanation
A pyrometer is instrument for measuring high temperature.
The optical pyrometer is one in which the luminous radiation from the hot body is compared with that from a known source.
There is an explanation video available .