first yahoo physics listing

No link directly to something on the history of physics, which is what I'm looking for now. (See next post for link to site.)

Now, its clear, I think, that Mendelev had a definite sense of atomic weights, and that means he knew, much more definitely than I do now (as represented by my calculations in the previous post) how many atoms are in a given mass. How did he know that?

Incidentally, I just read that the Planck Length is one billion-trillion-trillionth of a centimeter. How does that compare with my calculation? Let's say our stone is a cube, 100 centimeters to a side. Let's say each pebble is one centimeter across. One face of the cube, then, is occupied by 100x100=10,000 pebbles. A pebble, then is 100 grains of sand across, and a grain of sand is 100 particles of powder across, and a particle of powder is 100 atoms across, so the size of an atom (its width) is 100(grains)x100(particles)x100(atoms)=10,000x100=100,000 times smaller than a pebble, which is 1/100,000th of a centimeter ... much, much larger than the Planck Length. (Of course, I have not the slightest idea how accurate my estimate is.)