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真空是一种气体压强低于标准大气压的特殊气体状态，在国民经济的各个领域应用极其广泛，在机机械工业中应用也很广，尤其真空热处理技术、离子镀技术，具有重要推广价值，本文对此作简要论述。
Vacuum is a kind of special gas whose gas pressure is lower than standard atmospheric pressure. It is widely used in all fields of national economy and widely used in mechanical and mechanical industry. In particular, vacuum heat treatment technology and ion plating technology have important promotion value. A brief discussion of this.