Freezing Dynamics of Water
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This is a great video for helping students visualize why the denisty of H2O decrease upon freezing.
3 years ago 7
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Was it published in Nature 2002? Very impressive.
3 years ago 5
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All Comments (30)
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@vitroid0 - any recommended links showing the limits of precision in recovering real world properties? are there decent open source packages for this.
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:(
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Density decrease because molecules stabilize themselves leaving more space. Am I right?
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Very good.
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Does anyone know if this is an example of Homogenous nucleation i.e. the least likely type??
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can a simulation like this include gravity to show "ice floating"?
does recovery of the boiling point confirm the various parameters..
walter0bz 5 days ago
@walter0bz Computer simulation can reproduce the density difference between liquid water and ice, but the gravity (of the Earth) is too weak relative to the intermolecular interactions and that buoyancy is also too weak. If you apply extraordinarily strong gravity in the computer simulation, ice must float on liquid water.
vitroid0 5 days ago
@vitroid0
curious,
How do these simulations quantify van-der-waals & hydrogen bond strength.
are they fudge factors which then get tweaked till you recover correct boiling points :) or is the method more accurate.
walter0bz 5 days ago
@walter0bz Generally speaking, computer simulation result is not very precise as you imagine. The molecular interaction is designed (tweaked) to reproduce various physical properties, but no one can reproduce all the properties of water.
vitroid0 4 days ago
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.
vitroid0 4 months ago