A reliable thermometer helps you monitor fevers and maintain family health with ease, offering quick and accurate readings ...

The thermometer has a small bulb filled with either mercury (in older thermometers) or alcohol (in modern ones). When the temperature rises, the liquid expands and moves up the narrow tube.

In actuality, this liquid is more often alcohol than mercury. Another advantage of alcohol is that the freezing temperature of mercury is around -38F, so a mercury thermometer is not useful in ...

As in the form described in 1832 by John Phillips, a British geologist, this thermometer has a small air bubble near the top of the mercury column. As the temperature rises, the detached bit of the ...

When your child is sick, monitoring fever symptoms becomes something like a part-time job. And when you’re checking and rechecking (and rechecking . . .) your little one’s temperature, the ...