Nitrous oxide is a colourless gas. It has two nitrogen atoms and a single oxygen atom shortened as N2O. Nitrous oxide is typically used for sedation & pain relief by medical doctors & dental professionals. It has also been misused by people for recreational purposes.
Another use for nitrous oxide gas is as a petrol booster in cars. Nitrous oxide is not flammable at low temperatures. However, when super heated the oxygen is detached and helps combust the cars ordinary fuel and release more power.
The nitrous oxide sold here is for cooking purposes. It is used as a foaming agent in food & drink, whipping cream, making mousses, infusing flavours into alcohol and lots of other culinary uses.