What is "dichlorofluoromethane"

n. (context organic compound English) A particular halomethane or hydrochlorofluorocarbon, a colourless and odourless gas used as a propellant and refrigerant, harmful to the ozone layer.

Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon. It is a colorless and odorless gas.

Its critical point is at 178.5 °C (451.7 K) and 5.17 MPa (51.7 bar). At temperatures from 5 K to 105 K it has one phase in the space group Pbca.