A whipped cream charger is a steel cylinder or cartridge filled with nitrous oxide (N2O) that is used as a whipping agent in a whipped cream dispenser. The narrow end of a charger has a foil covering that is broken to release the gas. This is usually done by a sharp pin inside the whipped cream dispenser. The nitrous oxide in chargers is also used as an oxidizer in hybrid model rocket engines. Nitrous oxide is a popular recreational drug, and whipped cream chargers are a convenient source of the gas. Among users, the chargers are colloquially called whippets, nos, nossies, or nangs.The kitchen appliance that receives the charger is a whipping siphon.