The working substance of kerosene thermometer is kerosene, whose boiling point is generally higher than 150℃ and freezing point is lower than -30℃. Therefore, the measuring range of kerosene thermometer is about -30℃ ~ 150℃. Because the boiling point of alcohol is 78℃ and the freezing point is-1 17℃, alcohol thermometer can measure the temperature lower than kerosene thermometer, but it can't measure the temperature above 78℃. The range of mercury thermometer is -39℃-357℃.
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First of all, we should choose a thermometer with a suitable temperature range to prevent the thermometer from bursting when the temperature of the measured object is too high. If it is impossible to estimate the temperature of the measured object, a thermometer with a wide temperature range should be used first, and then a suitable thermometer should be selected, and its minimum graduation can meet the requirements of experimental accuracy. In order to reduce the influence of thermometer on the experimental system, it is required that the experimental system should have enough heat capacity to obtain more accurate experimental results.