At a substance’s boiling, freezing, etc, points, all of the substance must change to the next state. The condition of the bonds cannot remain the same at that temperature. For example, at 100° C water must change from a liquid to a gas. That is the speed limit of liquid water molecules. At 100° C the liquid bonds can no longer hold on and all the molecules convert to gas.
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Just reached this lesson, as we’re working through the Thermodynamics curriculum. Still seeing the duplicate video, so skipping for now … Can you please shoot us a note if content is added/changed, so we can come back and cover the material? Thanks as always!
This same video was already presented several lessons earlier (ref. https://www.sciencelearningspace.com/2014/10/thermometers/). Is the repetition deliberate? Thanks!