Zeroing in on Zero-Point Motion Inside a Crystal

To even “know” position, one must measure it. Because electrons are always in motion, if you want to know their speed perfectly, you won’t know their position precisely. You’ll have a probability of where the electron should be, but no definite position.

That’s all Heisenberg has to say. It doesn’t talk about your observations changing the thing you observed, it doesn’t “cause” anything to happen, it is not dependent on the consciousness of the observer and doesn’t make effects itself.

No, I'm using the literal definition: https://www.merriam-webster.com/dictionary/knowability

> I thought Hisenberg meant the more you knew about one property (i.e. the smaller the bound on the position of a particle) the less you knew about the other property.

Yes, this is it, but remove "you knew"... just - property. The more one property is defined, the less the other property is.

The key I'm trying to get across is it doesn't matter what you, the observer know/don't know (i.e. measure). As temp ->abs_zero, momentum becomes more-undefined/fuzzier. Nothing to do with you measuring.

The "other" property is fundamentally undefined (i.e. not knowable, i.e. able to be known).

Maybe we're getting hung up on our shared understanding of "knowable" and I shouldn't have used it, but it is, technically, the correct usage.