Nitrous oxide, also called nitrous oxide, is a colorless and sweet gas. It is an oxidant with the chemical formula n? O, under certain conditions, can support combustion (like oxygen, because nitrous oxide can be decomposed into nitrogen and oxygen at high temperature), but it is stable at room temperature and has a slight anesthetic effect, which can make people laugh. Its anesthetic effect was discovered by British chemist humphry davy in 1799. The theory is n? O and CO? If molecules have similar structures (including electrons), then their spatial configurations are linear, n? O is a polar molecule. In August 2009, a new study in the United States showed that this colorless and sweet gas has become the primary ozone-depleting substance emitted by human beings.