Chemical instrument simple apparatus
Commonly used instrument A: can't heating: measuring cylinder, air collector, funnel, thermometer, dropper bottle, petri dishes, jar, bottle mouth B: direct heating: in vitro, evaporating dish, crucible, burning key C: indirect heating: A beaker, flask, conical flask
1) should choose suitable thermometer measurement range. It is forbidden to outrange using a thermometer. (2) the liquid temperature, the vacuoles of the thermometer should be completely immersed in a liquid, but shall not contact the container wall, steam temperature measuring vacuole should be above the liquid surface, the measured temperature of the distilled fractions, vacuole should be slightly lower than the distillation flask branch pipe. (3) when reading, the line of sight should with liquid column meniscus high mercury thermometer () or low (alcohol thermometer) level. (4) replace glass rod with a thermometer is used for mixing is prohibited. After use should be wiped clean, loading paper set inside, away from heat source. Counter balance is a kind of instrument used for rough weighing material quality, every scales complete equipped with weights in a box. High school laboratory commonly used load 100 g (0.1 g) and 200 g (0.2 g) 2. Load and cargo volume, refers to the maximum to weigh. Sense refers to the amount of balance error (plus or minus), such as the sense of the amount of 0.1 g counter balance. Said its error is + / - 0.1 g, so it cannot be used to weigh less than 0.1 g quality goods.
Thermometer is used for measuring the temperature of the instrument. It is a lot of more phyletic, digital thermometer, temperature sensitive thermometer, etc. Is commonly used in the laboratory of glass liquid thermometer. Thermometer according to use and measuring precision is divided into 2 class standard and practical thermometer thermometer, standards for the high precision of the thermometer, it is mainly used for calibrating other thermometer. Utility refers to the thermometer thermometer for actual temperature measurement, mainly in experimental thermometer, thermometers, weather thermometer, clinical thermometer, etc. Middle school rod type commonly used industrial thermometer. One of the alcohol thermometer range of 100 ℃, mercury thermometer with 200 ℃ and 360 ℃ range specifications.
