Charging method and charging structure of combustible gas and oxidizer gas, and material to be charged by using the charging method and the charging structure

摘要

A charging method of a combustible gas and an oxidizer gas includes the steps of charging the combustible gas, and charging the oxidizer gas, both into a container through a charging port provided to the container. During at least one of two charging steps, a composition of a combustible mixed gas created in the vicinity of the charging port is controlled in a nonflammable range.