Posted by Ken See on Friday, March 05, 2004 at 8:48PM :
In Reply to: Maple/Vacuum 101 posted by Paul(in NY) on Friday, March 05, 2004 at 7:47PM :
So you lower the pressure outside the tree to a level lower than atmospheric, and the greater pressure differential pushes the sap out at a rate greater than if it were pushing against the atmosphere. Ok, I guess. Makes very good syrup, whatever the science is. Thanks.