system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do things frozen with liquid nitrogen become so brittle and easily broken?
gpt
Temperature is the measure of the random molecular kinetic energy of a substance. LN2 boils at a very low temperature, at -195 degrees C (-320F or 77K).

When things get colder, the motion of the molecules that make up that substance slows. Just like if you were to take an empty milk jug and fill it with scalding hot water, it becomes a lot more pliable, because the molecules are moving more quickly and can more easily slide past one another. Now, fill it with cold water, and it's nowhere near as pliable. Same deal. LN2 is just so cold, that it slows those molecules down a lot more, making it a lot harder for them to slide past each other so those bonds more or less just break.