Source: thermometer, Fish tank thermometer, Meat thermometer, Wet and dry thermometer - Ningbo Yinzhou Hongxiang thermometer factory
Alcohol thermometer mercury thermometer with the same structure, the only tube containing a red dye containing alcohol. Easy to observe, such a thermometer is used to work alcoholic substances. Due to the boiling point of alcohol (78 ℃) lower freezing point at -117 ℃, therefore more alcohol thermometer for measuring low-temperature material. kerosene thermometer material is the work of kerosene, which is generally higher than the boiling point of 150 ℃, freezing point lower than -30 ℃. Therefore, thermometer to measure the scope of kerosene is about -30 ℃ ~ 150 ℃. due to the boiling point of alcohol is 78 ℃, freezing point is -114 ℃. alcohol thermometer thermometer measuring kerosene than lower temperature, but higher than the temperature of 78 ℃ It can not be determined. from secondary school physics laboratory measurements often have to look at the temperature range, kerosene thermometer thermometer more suitable than alcohol. When students see the thermometer scale in 100 ℃, but without any analysis as to the alcohol thermometer thermometer, it is not correct (the temperature reached 78 ℃ alcohol already boiling, and how can we have 100 ℃ temperature scale). At present, secondary schools used in laboratory work with substances in red thermometer, a thermometer usually kerosene instead of alcohol thermometer
|
