Nitrous oxide is a colourless gas. It has two nitrogen atoms and 1 oxygen atom written as N2O. Nitrous oxide is typically used for sedation and pain relief by medical doctors and dentists. It has also been misused by people for recreational reasons.
Another use for nitrous oxide gas is as a petrol booster in cars. Nitrous oxide is not flammable at cooler temperatures. However, when super heated the oxygen is broken off and helps burn the cars normal petrol and release more energy.
The nitrous oxide sold here is for culinary purposes. It can be used as a foaming agent in food and drink, whipping cream, making mousses, infusing flavours into alcohol and many other foodcooking applications.