How to remove liquid nitrogen from a liquid nitrogen tank?

How to remove liquid nitrogen from a liquid nitrogen tank is as follows:
1. Directly pour out liquid nitrogen:

Generally, the small liquid nitrogen tank can be directly poured out from the liquid nitrogen tank, but this method should be careful to splash liquid nitrogen onto the skin and cause frostbite.
2. Liquid nitrogen pump:

With the foot pump on the air several times, liquid nitrogen can flow out.

liquid nitrogen pump

Note: This device can only be used on cans with a diameter of 50mm.
3. Infusion through self-pressurized liquid nitrogen tank:
The pressure is generated by vaporization of a small amount of liquid nitrogen in the tank, so that the container can automatically discharge liquid nitrogen, thereby supplementing the liquid nitrogen with other containers.

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