Not much to be honest.
they don't take any space up
lots
It takes up a cubic kilometer of space.
Energy takes up no space, at all.
not much :p
Not much to be honest.
it takes up about 2 gigabytes of space.
Gasses spread out to take up as much space as they can but it really depends on the amount of gas.
12
volume
Yes, they do. How much space they take up depends on how much you write. If you just write, let's say, a grocery list, then not much space will be used. But if you write stories on your notes, like my friend, then they can take up a lot of space. It just depends on what you use them for.
This is unrelated to ROBLOX, but I'm sure it wouldn't take up much.