Reasons for low-temperature nitrogen adsorption in liquid nitrogen

First, in order to avoid chemical adsorption, the low temperature of liquid nitrogen is conducive to reducing the chemical activity of substances;
Second, the number of nitrogen molecules per volume of liquid nitrogen is much larger than that of gas, which is helpful to accelerate the adsorption rate;
Third, liquid nitrogen can avoid mixing with oxygen, carbon dioxide and other impurities, because liquid nitrogen is distilled from air and is relatively pure.