Questions about liquid nitrogen
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If liquid nitrogen is heated to a temperature above its critical point, but the steel tank in question is thick enough to prevent an explosion, then the question arises: what state is the nitrogen in the container at this point? Is it still in a supercritical state (that is, a mixture of gas and liquid)?
I think this problem is related to the filling of liquid nitrogen; after it is filled, the temperature is -190°C, but during transportation it is at room temperature, so there must be a gas-liquid equilibrium inside the tank.