Kerosene thermometer range
There are many kinds of working fluids for temperature measurement, and thermometers use the unique physical characteristics of different working fluids to achieve temperature measurement! For example, if the temperature to be measured is low, you can choose an alcohol thermometer, and if it is high, you can choose a kerosene thermometer. Professional and experimental thermometers mostly use mercury thermometers to measure the ambient temperature from 0 to 400 degrees Celsius. Details are as follows:
1. The measuring range of kerosene thermometer is about -30℃ to 150℃ (the working substance of kerosene thermometer is kerosene, whose boiling point is generally higher than 150℃ and freezing point is lower than -30℃).
Second, the maximum range of alcohol thermometer is:? -1 17 degrees Celsius to 78 degrees Celsius? The boiling point of alcohol is 78℃, and the freezing point is-1 14℃.
3. The measuring range of carbon nano thermometer is: 18 degrees Celsius to 490 degrees Celsius.
Four, mercury thermometer measuring range: 0 degrees Celsius to 400 degrees Celsius. Commonly used: (1) The measuring range of thermometer is generally -30℃ ~ 50℃. (2) The measuring range of the experimental thermometer is-20℃ ~110℃. (3) The measuring range of the thermometer is 35℃ ~ 42℃ (the thermometer measures human body temperature, and the limit range of human body temperature change is between 35℃~ 42℃).
According to the working principle of liquid thermometer, glass bubble must be liquid, but any liquid will solidify or boil at a certain temperature, so each liquid thermometer has a certain measuring range (that is, from the freezing point to the boiling point of working liquid).
Matters needing attention in using kerosene thermometer:
(1) First, choose a thermometer with an appropriate 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.
(3) When measuring the temperature, the bulb of the thermometer must be in full contact with the measured object. If the temperature of the liquid is measured, all the temperature-sensitive bubbles should be immersed in the liquid and cannot collide with the bottom and wall of the container (because the temperature of the container is often different from that of the liquid).
(3) When reading, it can only be carried out when the liquid level in the thermometer is no longer changing, and the thermometer cannot leave the measured object, and people's sight should be flush with the liquid cylinder. The minimum calibration value of common liquid thermometer is 65438 0℃ or 0.5℃. Generally speaking, it is not necessary to estimate and read values smaller than the minimum scale.
(4) the thermometer should not be used as a stirrer to avoid breaking the light bulb. After use, wipe the outer wall of the thermometer with a soft cloth and carefully put it in the box to prevent bumping. Because kerosene thermometer is different from mercury thermometer, don't throw it before and after use to avoid inaccurate reading.
Kerosene thermometer is a relatively stable temperature measuring instrument with scientific and rigorous measurement data. Like mercury thermometer, it is widely used in our daily life and work.