What the title says, thanks!
In: 282
The ball gets heavier.
If you find a way to introduce photons inside a ball of perfect mirrors, like you teleport them in or something, and there’s a perfect vacuum inside the ball, they’ll bounce around forever.
That’s because the light inside will behave as a gas, called photon gas ([https://en.wikipedia.org/wiki/Photon_gas](https://en.wikipedia.org/wiki/Photon_gas)) and has pressure, temperature, the whole shebang. The added weight equals the energy of the photons, which will be very little. But its weight will defo increase. I swear I’m not… gaslighting you.
If you keep teleporting light in it, the temperature and pressure will increase until it reaches the melting point (or the breaking point, whichever first) of the material the ball is made of. Then it’ll crack and release the light inside all at once, which should be quite a flash.
Since we’re already in wonderland, with the perfect mirrors and perfect vacuum and teleporting light, we could add that the ball never melts and is unbreakable and perfectly insulating.
Then you can keep teleporting light in it, and you’ll start noticing it gets noticeably heavier.
You can’t do that indefinitely though. At some point, it’ll turn into a black hole.
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