Liquid nitrogen


Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent odor. As an important chemical raw material, ammonia is convenient for transportation and storage. Usually, gaseous ammonia is pressurized or cooled to obtain liquid ammonia. Liquid ammonia is easily soluble in water and dissolves in water to form ammonium ion NH4+ and hydroxide ion OH-, and the solution is alkaline. Liquid ammonia is stored in pressure-resistant cylinders or steel tanks and cannot coexist with substances such as acetaldehyde, acrolein and boron. Liquid ammonia is widely used in industry, is corrosive and easily volatile, so its chemical accident rate is high.
Physical and chemical properties:
Vapor pressure: 882kPa (20 ° C)
Density: 0.617g/cm3
Boiling point: -33.5 ° C
Molecular weight: 17.04 (about 17)