Accuracy is lost when thermometers are bumped or dropped.
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1. Liquid Thermometer 2. Bimetallic Thermometer
The same way you calibrate any thermometer. If you are not aware how to do this you should not be using one
A bimetallic thermometer uses a bimetallic strip wrapped into a coil. This strip usually consists of either steel and copper or steel and brass. A bimetallic thermometer is a type of thermometer made with a couple metal strips. They have differing thermal expansions that are brazen together. Any distortion in this apparatus caused by variations in the temperature is used to measure the temperature.
Its simple . to measure the temperature
Expansion and contraction
A bimetallic element is used in order to react it from various temperature that will indicated the temperature of an object or body.
If you mean by an "ordinary" thermometer, a mercury thermometer, the bimetallic type can measure a far greater range of temperature (mercury freezes at -38oC and boils at 356oC making it useless in the polar regions or for measuring high temperatures).Bimetallic thermometers are also more robust; mercury thermometers are usually made from glass and are fragile.
basically, a Bimetallic Stemmed thermometer is a thermometer that is used when cooking meats- like turkey (well turkey is poultry, but that is not the point) . They have a long stem that you poke into the meat and there is a dial on the top that tells you how hot the inside of the meat is.
In a thermometer,thermostat,clock or oven You can refer to wikipedia.:)