Flashback refers to the explosive or rapid combustion of hot flue gas caused by the introduction of oxygen when the indoor ventilation is poor and the combustion is in an oxygen...
Mar 18, 2022
Ethenyl ethanoate is an organic compound with a molecular formula of C4H6O2, a colorless flammable liquid with a sweet ethereal odor, mainly used in the synthesis of vinylon, an...
Degradable plastics refer to a class of plastics whose various properties can meet the requirements of use, remain unchanged during the storage period, and can be degraded into ...
Mar 17, 2022
Styrofoam is mainly made of polystyrene resin with additives such as foaming agent added. It is the most used buffer material.
air space The space above the Earth's surface within the atmosphere, excluding outer space. The air space above the national territory is an integral part of the territory o...
Mar 16, 2022
The Van Allen radiation belt, discovered by van Allen and his collaborators during their expeditions, consists mainly of electrons up to several megaelectron volts and protons u...
When natural light hits a non-metallic smooth surface, such as glass, water surface, etc., the reflected light will be partially polarized after being reflected, that is, the re...
Mar 15, 2022
Polarisation refers to the phenomenon that things are polarized under certain conditions, so that their properties deviate from their original state. Such as molecular polarizat...
Catalytic activity refers to the ability of a substance to catalyze and is one of the important properties of a catalyst. The catalytic activity of a substance is for a given ch...
Mar 14, 2022
The most basic element that makes up cells is the C element. Carbon atoms can be combined through carbon-carbon single bonds, or double bonds or triple bonds to form chain-like,...
Flocculation sedimentation is the process of flocculation and sedimentation of particles in water. After adding the coagulant to the water, the colloid and dispersed particles o...
Mar 13, 2022
Heavy metals refer to metals with a density greater than 4.5g/cm3, including gold, silver, copper, iron, mercury, lead, cadmium, etc. The accumulation of heavy metals in the hum...
