A batch of  nitrous oxide, laughing gas, with a total net weight of about 6 metric tons, has been delivered to an European buyer recentley. The molecular formula of the  gas is N2O, can be used in the electronics, cream & dairy, aerospace propellant. Its small package is quite popular with some household customers especially the homemaker. The cylinder，or called canister is small but not too small rightly fits in with the handheld operation at home.