The freezing point of Mercury is -37 °C, as it gets solidified and its minimum temperature cannot be changed with any catalyst. Whereas, the maximum temperature of Mercury can be altered up to 800 °C (1,470 °F) with the help of a different catalyst.

As the mercury is a poisonous substance, many countries have banned its use for the medical field and domestic use. Therefore, for medical use, the mercury thermometer has been replaced by the liquid metal Galinstan. Galinstan is a liquid alloy of three different metals i.e. Gallium, Indium, and Tin. Whereas, the Mercury filled Glass Thermometer is used in laboratories and industries.

However, a typical fever thermometer or used as in domestic purposes contains about 0.5 to 0.3 g of elementary mercury. If this amount of mercury from a thermometer is swallowed then it is said, that it causes little danger whereas, inhaling the Mercury in the vapor form could lead to serious health issues. As inhaling the mercury works as a slow poison and affect the Human Nervous System adversely, and slowly the level of mercury could rise with passing time on a regular basis. So, it is always instructed to handle the thermometer carefully and don’t let it break as it would be harmful to all. The thermometer needs to dispose of in a proper manner, don’t throw it anywhere or dump it in a garbage.