To what extent does nitrogen reach, people will suffocate.

The proportion of nitrogen in the atmosphere is 78%, because nitrogen is inert and cannot support combustion or directly react with other substances at room temperature. Nitrogen, carbon dioxide, methane, acetylene and neon are all directly asphyxiating gases. Its characteristic is that the increase of its own concentration leads to the decrease of oxygen content in the air and suffocation occurs. When the nitrogen content in the environment gradually increases and the oxygen content gradually decreases to 19%, people often feel dizzy. Generally, when the oxygen content in the air is lower than 18%, it will cause a simple suffocation accident. Its main manifestations are hypoxia, dizziness, headache, dyspnea, shortness of breath, rapid heartbeat, weak and fast pulse, trance, general fatigue and muscle coordination disorder. If you enter the equipment or container completely filled with nitrogen, people will immediately faint and suffocate until they die. In the usual chemical production, nitrogen is often used to empty the combustible gas in the pipeline. Because nitrogen is colorless and odorless, the hypoxic environment caused by nitrogen purging is often ignored by workers and even grass-roots managers.

Nitrogen is a colorless and odorless inert gas, and it is impossible to judge whether the nitrogen in a relatively closed space exceeds the standard only by senses. When the concentration of oxygen in the air decreases, the occurrence of suffocation accidents often has no obvious warning. According to the data, when a nitrogen suffocation accident occurs, it is difficult for the victim to escape or save himself as long as he stays in a relatively high concentration nitrogen space for 2 minutes. When the oxygen concentration in the working space is less than 10%, people will suffocate immediately.