KarlSethMoran
KarlSethMoran t1_jd6vmwt wrote
Reply to comment by blacksideblue in Can a single atom be determined to be in any particular phase of matter? by Zalack
I don't get what you mean by "out of phase". Gravity is exceedingly weak at the atomic scale, it can be safely ignored.
Atoms feel van der Waals attraction. It's a very weak interaction, but billions of billions times stronger than gravity at this scale still. It will get even noble gases into a crystal when there's sufficiently little motion.
KarlSethMoran t1_jd4ys58 wrote
Reply to comment by RevengencerAlf in Can a single atom be determined to be in any particular phase of matter? by Zalack
Sure. That is the electronic temperature. I was coming from the perspective of a classical point-particle picture and the kinetic, not thermodynamic, definition of temperature.
KarlSethMoran t1_jd4x47b wrote
Reply to comment by glurth in Can a single atom be determined to be in any particular phase of matter? by Zalack
That would define the electronic temperature, not the temperature of the atom in the classical, point particle picture.
KarlSethMoran t1_jd4fn4k wrote
Reply to comment by Zalack in Can a single atom be determined to be in any particular phase of matter? by Zalack
It doesn't. You need internal degrees of freedom to define temperature. An isolated atom has zero internal degrees of freedom due to Galilean invariance.
KarlSethMoran t1_ja8fpfy wrote
Reply to Roses are red, Violets are blue… by Glad-Passenger-9408
On LSD you choose the hue.
KarlSethMoran t1_j9b56m6 wrote
KarlSethMoran t1_j9ab9tm wrote
Reply to comment by nerdguy1138 in When something is bent (a metal ruler for example) and returns to its original shape, what is happening on the molecular level? Where is the information of the original shape stored and what forces do the unbending? by JewNugget2525
At low temperatures the thermal energy is too low to overcome the activation energy barrier required for the defect to migrate.
KarlSethMoran t1_j9ab3fs wrote
Reply to comment by WaltDog in When something is bent (a metal ruler for example) and returns to its original shape, what is happening on the molecular level? Where is the information of the original shape stored and what forces do the unbending? by JewNugget2525
The charge cancels out, but that doesn't mean they can't stay put. Imagine a positive charge in the middle of a triangle and three smaller identical negative charges in the corners, for instance.
In reality it's a bit more complex than that. Electrons are fermions, and that means that they experience so-called Pauli repulsion. This is what prevents two atoms from falling on top of one another, and what prevents you from inserting your hand into the table. On top of that there are dynamical electromagnetic effects, known as dispersion, that lead to electromagnetic attraction even between uncharged objects. For instance two atoms of argon, both neutral, will attract one another unless they are very close to one another.
In an iron lattice the cohesion is due to the electrons stabilizing the nuclei.
KarlSethMoran t1_jdudsrs wrote
Reply to An ape’s favourite music group is obviously The Monkeys. What is their next favourite? by Spocks-Nephew
The Monkees, spelled correctly, probably.