Put the inflated balloon into a beaker and pour in liquid nitrogen until all the nitrogen is evaporated. What will happen in the process? Please use the physics knowledge you have learned to solve it.

Very dangerous. It is almost impossible to succeed.

Liquid nitrogen has a very low boiling point, and it has been vaporized before being poured into the beaker, while absorbing a lot of heat.

Balloons and beakers can't touch liquid nitrogen, but the temperature of freshly vaporized nitrogen is extremely low.

It will cause the beaker to crack due to uneven temperature.

As for the balloon, it collapses instantly, and the rubber will become brittle and lose its elasticity at low temperature, which is extremely easy to destroy and even spontaneously rupture.

Improper operation by outsiders can cause frostbite and even endanger life.

If this question was written by a junior high school teacher, that person should read a good book. In addition, you can look at the power of liquid nitrogen in the American movie "Ambush on All Sides" for your reference.

There is no answer to the joke that balloons are getting smaller and smaller.