Freezing Dynamics of Water

[irenesmh]

:(

[vitroid0]

Right. But the density decrease in the late stage of crystallization. This movie is showing the very early stage of nucleation where density change is small.

[RichtoffenRoach]

Density decrease because molecules stabilize themselves leaving more space. Am I right?

[maganhaluciana]

Very good.

[TheJaegerjoe]

Does anyone know if this is an example of Homogenous nucleation i.e. the least likely type??

[zigero]

LOL? and the whole process in 300 ns , which are 3 tenmillionths of a second . Nature is incredible.

[slabkoff]

To the author,

I stumbled on this video about a month ago. I used it to teach third graders how water freezes at the molecular level. Guess what, they understood it! It was amazing to show them this. A complex concept like water freezing - and why it's less dense than liquid water is nearly impossible to teach 9 year olds - until now. Thank you for creating this video. S Labkoff Substitute Science Teacher, Bicultural Day School, Stamford, CT

[Everythingisound]

@nickharvey, Check out hydrogen bonding....

[nickharvey7]

Good vidio!

I take it freezes in to the most efficient shape for placing the atoms together?

[marsCubed]

@nickharvey7

Nature employs 'least action'.

As I understand it, water molecules are continually colliding while making and unmaking weak bonds with each other. As water freezes, kinetic energy is removed from the system, bonds of particular geometries begin to dominate over collisions.

Nature just bumps along or gets bumped along. it tends to fractal forms, star dirt & wobbly stuff. average temp, 2.73 kelvin.

Life systems find efficiency.

Evolution led to bees making honeycombs 'efficiently'

[nickharvey7]

@marsCubed Thanks for this it sounds right!

[jtjjbannie]

With all that action, you'd think it would boil!

[rockstar1720003]

Brilliant

[Leszek1024]

cool

[sodium1545]

This is a great video for helping students visualize why the denisty of H2O decrease upon freezing.

[omerendero]

@sodium1545

funny enough: the simulation was at constant volume...

[freequeshowe]

Awesome!

[JungyongW]

Was it published in Nature 2002? Very impressive.

[myusername20202020]

JungyongW:

Regarding that Nature 2002 (MD water freezing) paper:

To me it seems very surprising to homogeneously nucleate Ice crystalization from liquid water at only 2K supercooling within about 250ns.

[omerendero]

@myusername20202020

in fact the system was at negative pressure, so the effective supercooling was more than 2 K.

[JungyongW]

Was it published in Nature 2002? Very impressive.

[gargara]

nice model!