All I know is that it is a physical and chemical index. What does the Jin Xuan meeting mean?

Physical and chemical indicators refer to technical indicators such as physical properties, physical properties, chemical composition, chemical properties and chemical properties of products, and are also quality indicators of products. For example: car load, top speed, fuel consumption, etc. , TV image resolution, service life, etc. Content of chromium, nickel and titanium in stainless steel, corrosion resistance, etc. , alcohol content, alcohol specific gravity, boiling point, ignition point, calorific value, etc. Physical and chemical indicators are tested according to national standards and standard testing methods.