then as I assumed, it's over my head. But I grasp a bit of it.
On Thu, 19 Feb 2009, Dan Rossi wrote: > On Thu, 19 Feb 2009, Spiro wrote: > >> Thank you Max, >> so being that the value here is higher than 14.7, what makes it unlike one >> atmosphere? > > Not sure what you mean Spero. What value is higher than 14.7? Max's > calculations show that the vacuum pulls about six pounds per square inch. > If you multiply that by the cross sectional area of the hose, 63.14 square > inches, you get about 18.8 pounds of force. That is pounds of force not > pressure. The pressure is still only six pounds per square inch. > > That is the cool thing about pressure when used over a large area, you can > really get a lot of force from a relatively small amount of pressure. > > Max wrote: > >>> Assuming you are speaking about the demonstration of the bowling ball being >>> held up by the vacuum cleaner, it would be the cross section area of the end >>> of the hose times the amount of vacuum. A 2 inch diameter hose would have >>> an area of pi square inches. If the static vacuum was 6 pounds per square >>> inch the holding power would be 6 pi or about 18.8 pounds. If I did the >>> conversion right, 6 psi is about 160 inches of water column. > > > -- > Blue skies. > Dan Rossi > Carnegie Mellon University. > E-Mail: d...@andrew.cmu.edu > Tel: (412) 268-9081 >
