Superheating, supercooling, or supersaturation can happen when the water molecules are very still, and very pure, without other molecules around them.
32.
When a dendrite growth cycle was completed, the small crystalline structure was re-melted and another grown at a different " supercooling " temperature.
33.
We can say then that the size of the initial and transition zones are controlled by the extent of supercooling beyond the already low freezing temperature.
34.
When solidifying a liquid, the interface is often unstable, and the velocity of the solid liquid interface must be small in order to avoid constitutional supercooling.
35.
Unlike the transition to gas, there is no equilibrium at this transition under constant pressure, so unless supercooling occurs, the liquid will eventually completely crystallize.
36.
If the freeze-casting setup is controlled so that nucleation is favored at only small supercooling, then the TZ will give way to the SSZ sooner.
37.
For instance, MgSO 4 has a eutectic of-3.6�C but through supercooling can remain liquid for an extra-15.5�C below that.
38.
If the material is kept still there is often nothing ( such a physical vibration ) to trigger this change, and supercooling ( or superheating ) may occur.
39.
The fluids eventually reach the supercooling point, which is the temperature at which the supercooled solution freezes spontaneously due to being so far below its normal freezing point.
40.
Constitutional supercooling, which occurs during solidification, is due to compositional changes, and results in cooling a liquid below the freezing point ahead of the solid liquid interface.
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