Nitrous oxide is a colourless gas. It has 2 nitrogen atoms & a single oxygen atom written as N2O. Nitrous oxide is typically used for anesthesia & pain relief by medical professionals & 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 cooler temperatures. However, when super heated the oxygen is broken off and helps burn the cars usual fuel and release more power.
The nitrous oxide sold here is for food and drink uses. It is used as a foaming agent in food and drink, whipping cream, making mousses, infusing flavours into alcohol & many other culinary applications.