Originally Posted By: paul

the vacuum is pulling on the top of the water in the straw.

I think for our purposes it doesn't matter if you say the vacuum is pulling or the atmosphere is pushing. The net force adds up to the same. Just have to remember that vacuum's pulling force is limited, as Momos has explained.

So can we get onto the actual device? Or are you still working it out?

Last edited by kallog; 05/03/10 10:43 AM.