Question

I remember seeing this really clever proof for an electron's mass based on a droplet of oil's drag as it accelerated.

Or something like that. Anyone recall something like this? I'd like to see it again.

Answer 1

I saw it in a textbook. So, no, no psuedoscience here. >.>

Answer 2

Yes, this is an important experiment:
http://en.wikipedia.org/wiki/Oil_drop_experiment

Answer 3

Thanks! It's been a while since I've seen this. It's really cool.