Calorimeter calibration thermal capacity considerations

Coal chemical calorimeter calibration thermal capacity of the precautions 1, five times the use of benzoic acid should be the same batch (heat value), and the weight as consistent as possible, a difference of <0.001g is appropriate.

2. The temperature difference between inner and outer barrel waters for five times is as consistent as possible, and the difference is <0.1°C.

3. The first sample is best treated as a waste sample, so the entire system is not yet balanced.

4, the ambient temperature and the barrel water temperature as consistent as possible, very bad <1 °C is appropriate.

5, five times the result is bigger than once or smaller than once should find the reason after the heavy bid.

6, five samples should be carried out in succession.

7. When the extreme value of the five times heat capacity is ≤ 40 J/K, the average of five times is used as the heat capacity of the instrument.

8. It is not allowed to perform the fourth time (even two or three times) when the thermal capacity is very small, and the fifth time is not done. It is also not allowed that the thermal difference of the five times is less than or equal to 40 J/K. However, if the range is slightly larger, make up one or two times, and find the average value of the five extremely small and small values ​​as the heat capacity of the instrument.

9, if the five thermal capacity of the range of> 40J / K, it should be done once, from which to choose the five range ≤ 40J / K, find the average value as the instrument's heat capacity. Make a time not, but also make up make once. If there are no five extremes ≤ 40J/K out of seven, you must find out the reason and re-calibrate the original data.