QOTD–entropy edition

It is only through labor and painful effort, by grim energy and resolute courage, that we move on to better things.

–Theodore Roosevelt

Related: In a closed system, entropy (disorganization) will always increase unless energy is applied to the system.

–Second Law of Thermodynamics, Sir Isaac Newton

Can a liquid freeze and boil at the same time?

Of course!

In thermodynamics, there’s a concept known as triple point: it’s a combination of temperature and pressure where a substance can exist as a solid, liquid and gas, all at the same time. This is what it looks like.

It’s not often people outside a lab get to see what this looks like, because you need a vacuum pump and some chemistry kit to achieve it. But it is amazing to see a fluid freeze and bubble and look like still liquid all at the same time.