[China Glass Network] Some students are afraid of trouble and use the centrifugal test tube to heat directly. Due to the uneven thickness of the bottom wall of the centrifuge tube, the crack is caused. For heaters that require accurate weighing, they are placed in the dryer immediately after drying and removal without cooling. After the hot appliance with a very high temperature is placed in the dryer, the air in the device is heated and expanded, which may open the cover; even if it is covered, the air pressure inside the device may be lowered to a pressure lower than the air pressure outside the device. To make the cover difficult to open. Some may cause cracks in the dryer; when moving the dryer, do not hold the lid with the thumb of both hands, only the lower part, so that the lid of the dryer slides down and breaks, causing damage to the artificial instrument. The psychological barriers and carelessness of the experimenter are another reason for the damage of the glass instrument. In the normal teaching, if the teacher over-emphasizes the improper relationship of the experimental operation, the students will be afraid and anxious when doing the experiment, and the experiment will shrink. For example, when testing the purity of hydrogen, fear of igniting hydrogen, holding a test tube filled with hydrogen, and delaying to approach the flame, when the finger is released to hear the sound of explosion, the test tube also falls in panic. Some careless students go directly to the container that has just been heated, but instinctual self-protection, throwing away the instruments in their hands, causing damage to the glass. When the pH value of the solution is measured, the glass bulb of the glass electrode is very thin, and it is broken due to accidental bumping of the beaker or the hard object. If the glass electrode is not provided in time, the acidity meter cannot be used, causing great loss. And waste. When washing the acid and alkali burette, the nozzle of the titration tube is broken after the advancement; the acid burette is broken due to the corrosion of the rubber band, causing the piston to fall off and break. When holding the instrument with an iron clamp, either the clamp is too loose to cause the instrument to fall off; or the clamp is too tight to break the instrument. After the centrifuge rotates at a high speed, the force is used to twist the centrifuge tube, causing the centrifuge tube to break, even cutting the hands of the experimenter. When holding the iodometric bottle from the balance chamber to the laboratory, it was rushed. The paper did not pinch the neck of the iodine bottle, and accidentally broke the surface of the iodine bottle. Prevention and measures to enhance ideology and enhance students' ideology of loving experimental instruments is an important prerequisite for reducing the loss of glass instruments. Students' previous classes are more important. In the previous experimental class, the experimental teacher must combine the laboratory rules, the student's experimental hand, the emergency measures for general injury in the laboratory, and the regulations on compensation for damage to the student's equipment, so that the students can educate the instruments and equipment. To enable students to understand the importance of caring for instruments, so that they truly understand the damage of the instrument, not only cause economic losses, but also lead to experimental failure, and some even critical personal safety. In the laboratory where students do experiments, they often encounter the pictures that are often encountered in normal times. The pictures that are damaged due to various reasons are accompanied by short text descriptions, and the students can see the reasons for the damage of the instrument. The recycling of used glass instruments in the experiment can be repaired and reused with a slightly damaged glass instrument. For example, the bottom perforated test tube can be reused by closing the hole with fire. If the tube is damaged and the pipette is damaged, the upper part of the broken tube can be cut off and then melted on the flame to continue to be used. The resection of the branch tube above the test tube can be used for ordinary test tube use. Disposable Cleaning Non Woven Fabric Non Woven Fabric,Woven And Non Woven,Non Woven Roll Price,Non Woven Disposable Products Zhejiang Wangjin Nonwovens Co., Ltd , https://www.wangjinnonwoven.com