Page 2 - LESSON 15 MM1

Clinical thermometer:

 A medical thermometer is used for measuring human or animal body
temperature.
 The tip of the thermometer is inserted into the mouth under the

tongue, under the armpit, into the rectum via the anus, into the ear,
or on the forehead.

 It was invented by Daniel Fahrenheit, in 1714.
 A thermometer works on the principle that solids and liquids expand

on heating.
 As the temperature rises, mercury expands causing it to move

upwards and depict the temperature.
 As the temperature of the bulb rises, the liquid expands up the tube

through the constriction.