ABSTRACT
A liquid-in-glass thermometer uses the expansion of a liquid with increase in temperature as its principle of operation.
At the end of this chapter you should be able to:
• describe the construction, principle of operation and practical applications of the following temperature measuring devices:
(a) liquid-in-glass thermometer (including advantages of mercury, and sources of error) (b) thermocouples (including advantages and sources of error) (c) resistance thermometer (including limitations and advantages of platinum coil) (d) thermistors (e) pyrometers (total radiation and optical types, including advantages and disadvantages) • describe the principle of operation of (a) temperature indicating paints and crayons (b) bimetallic thermometers (c) mercury-in-steel thermometer (d) gas thermometer • select the appropriate temperature measuring device for a particular application.
