Description:

A thermometer is an instrument used for measuring and indicating temperature. It is typically comprised of a narrow, hermetically-sealed glass tube that is marked with graduations. At one end, it has a bulb containing mercury or alcohol, which extends along the tube as it expands. Laboratory thermometers are used to measure temperatures or temperature changes with a high degree of precision. They are made of metal or glass and strengthened through thermal tempering or annealing.