hello there!
your answer is a “generator”
a generator does not create energy but instead it transforms it.
it’s basically a motor working in reverse.
3. dark matter
empty space could also be a simple vacuum
= initial pressure
= final pressure = 2
= initial volume
= final volume = /4
= initial temperature = 20 c = 20 + 273 = 293 k
= final temperature = ?
using the equation