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Source of error in physical and chemical experiments

Physical and chemical testing is one of the main testing parts of laboratory testing, and its testing results are the main scientific basis for determining product quality. There are three main sources of error in physical and chemical laboratories: systematic error, random error and human error. Then, what are the specific causes of each error?

18 Tips For Glassware Safety In Laboratory

Glassware are often used during the experiment, so accidents are common, so it is very important to know the properties of the glass before using glassware.Hardness ———– hardness is 6~7, brittle, cracks are shell-like like sharp tools.Strength ———– Strong resistance to pressure but weak tensile strength , easy to break.Heat resistance ——– poor thermal conductivity,

Manual-Blowing-of-Glassware

18 Tips For Processing Safety of lab glassware instruments

Glass cutting 1.. It is necessary to fully confirm whether the glass to be cut is deformed or cracked, and it cannot be used if it is unqualified. 2. The glass tube (rod) must be passivated in advance if both ends is sharp. 3. First use a trowel to draw a scratch at the place

Kit-Organic-Chemistry

Commonly Lab Glassware Names and Uses

1、Round (flat) bottom Boiling flask ●Specification: Capacity (mL) 5-2000, can be matched Rubber stopper ●Main use: heating and distilling liquid, flat-bottomed flask can be equipped Washing liquid ● Note: Generally avoid direct heating on the fire, should be stone Cotton net or various heating sleeves, heating bath heating, etc., ●The contents are not More than 2/3

4 tips for safely heating glassware in the lab

1. The heating process is a common step in physical and chemical analysis. In actual work, some people often ignore or simply can’t figure out which instruments can be heated, and even make mistakes. In fact, laboratory glassware are not directly heated, such as measuring cylinders, measuring cups, volumetric flasks, reagent bottles, etc. can not

What is the difference between crystal glass and ordinary glass?

1, Crystal glass is called artificial crystal. Because natural crystal is rare and not easy to mine, it can not meet people’s needs, so artificial crystal glass is born. Because of its high transparency, it can be made into a variety of handicrafts. 2, Ordinary glass Ordinary glass is a relatively transparent solid material that

Drying of lab glassware instruments

The lab glassware instruments often used in experiments should be cleaned and cleaned after the experiment is completed. According to different experiments, there are different requirements for the drying of glassware. Usually, the beakers and conical flasks used in the experiment can be used after being washed. Glassware used in organic chemistry or organic analysis

Use of lab glassware

Organic experimental glassware can fall into two categories: standard grinding and general glassware according to the standard of its mouth plug and grinding. Since the standard grinding glassware can be connected to each other, their use is time-saving and strict and safe, and it will gradually replace the general glassware instruments. We should be handled

Laboratory glassware classification

According to internationally accepted standards, glassware and glass products used in laboratories are generally classified into the following eight categories: (1) Transportation and interception devices: including glass joints, interfaces, valves, plugs, tubes, rods, etc. (2) Containers: such as dishes, bottles, beakers, flasks, tanks, test tubes, etc. (3) Basic operating instruments and devices: for example, for

Common equipment maintenance regulations

First, electronic equipment a. Non-recurrent electronic equipments should be cleaned regularly, dusted, and regularly energized to prevent components from being damaged by moisture. b. Regularly perform part inspection and performance testingto understand the technical status and ensure that the equipment is always in good working condition. c. Equipment that uses a rechargeable battery to maintain

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