Free Memory on iPAd - What's the Algorithm ?

[peled]

Since I added the tweak showing the current free memory I have . I really am amazed at what is going on.
I assumed that the more applications I am running, the less memory Ill have.
But No
Many times I get to the point of say 20MB , and then I activate AppStore, and suddenly my free memory jumps up to 80MB.
Does iOS is cashing RAM into the flash an retrieve it later on ?

 

[twerppoet]

iOS 4 is supposed free RAM as needed. It does this by removing older apps from RAM to make room for new apps when they are opened. If the oldest app used more RAM than the app you are opening there should be a net gain in free RAM.