- #1
nonequilibrium
- 1,439
- 2
(posting here as to avoid any discussion about QM or relativity)
I think everyone at first sight wouldn't expect that if you'd enlarge an ant to the size of a house, it would collapse. Well, I'd intuitively except scale-invariance. Yet it would collapse under its own weight.
So is the fact our world exists out of atoms the explanation?
Shouldn't we also scale up the atoms if we want to be honest about our scaling-up?
And even if it were the atoms: why didn't people use this as evidence of the atomic theory sooner?
Apparently Galileo already discovered this non-scale-invariance in nature and wrote about it. If it's only explainable by the concept of atoms, then it's explanation was simply a mystery for 100's of years? (although we never read about it having been a problem)
I think everyone at first sight wouldn't expect that if you'd enlarge an ant to the size of a house, it would collapse. Well, I'd intuitively except scale-invariance. Yet it would collapse under its own weight.
Another example: we see in the newspaper, every once in a while pictures of a great cathedral made with little matchsticks...If we imagine that this wooden cathedral were actually built on the scale of a real cathedral, we see where the trouble is; it would not last -- the whole things would collapse because of the fact that scaled-up matchsticks are just not strong enough. ...
Today, of course, we understand the fact that phenomena depend on the scale on the grounds that matter is atomic in nature, and certainly if we built an apparatus that was so small that there were only five atoms in it, it would clearly be something we could not scale up and down arbitrarily. The scale of an individual atom is not at all arbitrary -- it is quite definite.
- Feynman (lectures, vol 1, 52-3)
So is the fact our world exists out of atoms the explanation?
Shouldn't we also scale up the atoms if we want to be honest about our scaling-up?
And even if it were the atoms: why didn't people use this as evidence of the atomic theory sooner?
Apparently Galileo already discovered this non-scale-invariance in nature and wrote about it. If it's only explainable by the concept of atoms, then it's explanation was simply a mystery for 100's of years? (although we never read about it having been a problem)