Liquid nitrogen: liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable, and extremely low in temperature. Nitrogen constitutes the majority of the atmosphere (volume ratio 78.03%, weight ratio 75.5%). Nitrogen is inactive and does not support combustion. A large amount of endothermic contact during vaporization causes frostbite.

     At normal pressure, the liquid nitrogen temperature is -196 ° C; 1 cubic meter of liquid nitrogen can be expanded to 696 cubic meters of pure gaseous nitrogen at 21 ° C. Liquid nitrogen is a colorless, odorless liquid and gas that is cold at high pressure.

     Liquid nitrogen (often written as LN2) is a liquid form formed by nitrogen at low temperatures. Nitrogen has a boiling point of -196 ° C. At normal atmospheric pressure, if it is below this, liquid nitrogen is formed; if pressurized, liquid nitrogen can be obtained at a higher temperature. .

     In the industry, liquid nitrogen is obtained by fractional distillation of air. After purifying the air, it is liquefied in a pressurized, cooled environment and separated by the boiling points of the components in the air. Nitrogen (78.09% of the air volume) was first released (and not liquefied), followed by 0.93% argon in the air and finally 20.95% oxygen.

     When the concentration of inhaled nitrogen is not too high, the patient initially feels chest tightness, shortness of breath, weakness and weakness; then there is irritability, extreme excitement, running, screaming, screaming, gait instability, called “nitrogen strontium”, which can enter drowsiness. Or coma. When inhaled at a high concentration, the patient can quickly stun and die due to breathing and heartbeat.

    1. Quickly evacuate people from the contaminated area to the upper winds, and set up isolation areas to strictly restrict access.

    2. Notify fire and related units.

    3. Emergency personnel wear self-contained positive pressure breathing apparatus, wear winter clothes, and wear cold gloves.

    4. Avoid leaking liquid into the basement or other closed working spaces. If it is unavoidable, notify the relevant department immediately.

    5. Do not touch the spill directly.

    6. Cut off the source of the leak as much as possible.

    7. Spray with a mist of water to accelerate liquid evaporation, but do not allow the water gun to hit the liquid.

    8. Prevent the gas from accumulating in the low recess, and use the exhaust fan to send the leaked air to the open space.

    9. Personnel are prohibited from staying in low-lying or leeward areas.