[SimoneMeyer]

If you were to bring a ball (which is made of rubber and is filled to it's normal volume at 22 degrees C) on the moon, where the atmospheric pressure is zero, what effect would it have on the ball?

All that I can think of is that it would float (because of zero gravity), but I'm rather certain that this answer is not what they are looking for. Because the pressure is of zero, would there even be any effect on the ball, or would nothing happen at all?

[Arctic-Nation]

No, the ball will not float, as gravity on the moon is not zero. It will, however, fly much further than on Earth if tossed or kicked due to the lack of atmosphere and smaller gravity.

One effect is that the ball will lose its air much faster as the overpressure is higher than on Earth, and another that the rubber will start breaking up quickly due to the more intense UV radiation. If that's the right answer, however...

[renge ishyo]

Don't get sidetracked by thinking about gravity, the question wants to know what will happen to the balloon when you suddenly decrease the pressure outside the balloon to zero. So your answer must have something to do with the change in atmospheric pressure while on the moon. Here's something to think about to start, on earth when you raise the temperature of a gas inside a balloon the balloon expands until the pressure inside the balloon matches the atmospheric pressure outside the balloon. So knowing this if you take this balloon to the moon what will happen?

[SimoneMeyer]

The balloon will pop or deflate because it's inside pressure has to match the ambient pressure?

[renge ishyo]

I think that is a reasonable answer.