00:00This is the ring, and here is that brass ball.
00:05It goes through there quite easily.
00:12Here's the ball.
00:19Let's see.
00:21Now it doesn't want to go through.
00:23So we leave it like that and we'll see what happens.
00:26So the ring will now expand a little because it gets hotter
00:30and the ball will shrink a little because it gets colder
00:33and it shouldn't take too long for the ball to be able to get through.
00:38If I heat them both with the torch,
00:41then, of course, they will always be able to go through each other.
00:50There it goes.
