Hi! Well, I don't have any exact numbers for how many pounds you can
lift with one of these magnets or anything, but I have a couple of
these magnets at home, so I think I can still answer your question...
Neodymium magnets are the kind of magnets used in computer
hard-drives, among other things. If you ever manage to get your hands
on an old broken
computer hard-drive, try opening it up and
check out the magnet inside. (Be very careful when doing this - there
may be some very sharp edges around the magnet.) Also be careful about
handling the magnets themselves. While it is possible to pull two of
them apart using your bare hands (if you pull really hard), it really
hurts if your fingers get pinched in between.
So how strong are they? Well, using 1 small hard-drive magnet, I
can attach a small notepad almost 1 cm thick or a normal sized notebook
about 1/2 cm thick to my refrigerator door securely. And it does
sometimes take some tugging to get them off again.
(republished on 07/13/06)