Common household thermometer - — A thermometer

Before have no contact with industrial thermometer, in my impression about equals liquid thermometer, glass thermometer and common glass thermometer is the mercury thermometers. A thermometer is a kind of can records have determine the highest temperature of the thermometer. After using the thermometer should be & other; Back to the table & throughout; , namely with the upper part of the thermometer off down hard, can make have to tube of mercury, back in the vacuole. Other thermometer can't shaking, this is the thermometer and other liquid thermometer a major difference. The ordinary thermometer are being electronic thermometer ( The figure below) Replaced, electronic thermometer has temperature measurement speed is quick, the advantages of non-contact, but also has the defects of waste battery pollution of the environment. Mercury thermometers also called & other; Clinical thermometer & throughout; Work, the material is mercury. The vacuole volume is much bigger than the volume thin tube above. Mercury in the bubble, due to the influence of temperature, produce small changes, the expansion of the volume of mercury, make the length of the tube of mercury obvious changes. Human body temperature changes generally between 35 ℃ to 42 ℃, so the thermometer calibration is usually 35 ℃ to 42 ℃, and the scope of each degree and into October, so the thermometer can be accurate to 1/10 of a degree. As to why only 42 ℃, the highest thermometer clickable article: why thermometer highest only 42 ℃?