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.
New!!: R21 and Dichlorofluoromethane ·
HMAS Melbourne (R21) was a ''Majestic''-class light aircraft carrier of the Royal Australian Navy (RAN).
New!!: R21 and HMAS Melbourne (R21) ·
R-phrases (short for Risk Phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations.
New!!: R21 and List of R-phrases ·
The R-21 (Р-21; NATO: SS-N-5 'Sark/Serb'; GRAU: 4K55) was a submarine-launched ballistic missile in service with the Soviet Union between 1963 and 1989.
New!!: R21 and R-21 (missile) ·
The R21 was a New York City Subway car built by St. Louis Car Company in 1956-1957.
The R21 is a major north-south provincial route (with a freeway portion designated as a National Road) in eastern Gauteng Province, South Africa.
New!!: R21 and R21 road (South Africa) ·
The Renault 21 is a large family car produced by French automaker Renault between 1986 and 1994.
New!!: R21 and Renault 21 ·
USS R-21 (SS-98) was an ''R''-class coastal and harbor defense submarine of the United States Navy.
New!!: R21 and USS R-21 (SS-98) ·