How to Draw Phase Diagrams and What they Mean! | Doc Physics

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Let’s consider how stuff changes phase. Solid to Liquid to Gas or skip-a-step.

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33 Responses

  1. Istiak Nihal says:

    Gas to solid= deposition

  2. Andjela Tatarovic says:

    thank you! do you have experiment examples, of how pressure is kept constant, or added, and how these 3 different properties are manipulated? thank you!


    this is awesome.

  4. Aditi Prajapati says:

    Thank u so much sir…

  5. Maaz Mulla says:

    Hey Doc, I have a question about phase changes. My MCAT General Chemistry book says that: "Phase changes are reversible, and an equilibrium of phases will eventually be reached at any given combination of temperature and pressure."

    I am a bit confused about the second part of the statement. I get that when you have a liquid at like room temperature in a closed container, you have some molecules that have enough KE to enter the gas phase, and some gas molecules with low enough energy to enter the liquid phase. 

    But does equilibrium also happen with a block of ice? So let's say we have water at -20C. To us, it looks totally frozen as a piece of ice. But on the molecular level, are some of the particles with enough energy actually "melting" to become a liquid? Then are those liquid particles "freezing" to become ice again? 

    If this above statement is true, what does the term melting point even mean if technically even at -20C, some of the ice is melting? Is melting point just the point where the equilibrium that is established favors the liquid form over the solid form?

  6. Loide Emvula says:

    God bless you. we luv u

  7. M Cai says:

    That noise, 4.45.

  8. Samima Akter says:

    Please add English subtitle

  9. cp soup says:

    i can see that led zep reference 🙂

  10. Abid Ali says:

    highly appreciate your work>>>can you make a video about 2nd law and entropy explained with derivations????

  11. Tales C. says:

    How to plot a phase diagram using computational skills? Where can I find a table with experimental data needed? I need to plot it using experimental data and then compare it to Van der Waals equations.

  12. Matthew Anderson says:

    The direct solidification of a vapor (the opposite of sublimation) is called deposition.

    A common substance that sublimates at room temperature and pressure is dry ice, or solid CO₂.

  13. Barry Piper says:

    Recommend you work from a script in the future. Your thoughts were all over the place.

  14. adnan ameer says:


  15. Monazza says:

    gas to solid is Hoar Frost.
    perverted but yeah.

  16. HASEEB SHAHZAD says:

    nice explanation

  17. Asfaque Khan says:


  18. bert says:

    so what happens when you pass 12 volts through water. hho

  19. Anood AlKatheeri says:

    The substance that goes from solid to gas is dry ice (CO2)?

  20. Rena Katz says:

    So the hydrogens and oxygens have the same avg kinetic energy, but the hydrogens are moving much faster bc their mass is so much smaller? Am I understanding that correctly?

  21. GlidingAbove says:

    WoW, you are awesome, really nice job.

  22. kimrainman says:

    the most shocking part is 10:35. Ice melts when you increase pressure…. wow..

  23. rupard34 says:

    13:10… Led Zeppelin Reference?

  24. ally kessler says:

    sublime i love your videos even more!

  25. Rebecca Evans says:

    0_o I feel not-ADHD when watching your videos–and I understand you.  DANKE.

  26. Halim Adams says:

    Thank you so much!!!! This helped so much!

  27. arief ramadhan says:

    Very helpful, step by step learning

  28. Cosette Perez says:

    Very helpful and colorful. 🙂  Nice way to explain it, made it so easy to understand.

  29. Israel Gräbie says:

    gas to solid is deposition

  30. Logan says:

    You're awesome

  31. The Truth says:

    When the solid is going straight into the gas phase using sublimation, you say that the pressure should be kept very low. I think i get that considering that low pressure causes condensation but then why does the graph show that the sublimation curve increases with pressure as you increase with temperature when going from solid to gas?

  32. Doc Schuster says:

    Dry ice, indeed. Ted Drewes gives that out if you're eighteen and you've got some driving to do…If you bring some to class I could show you a few nice tricks. And I don't think anything is interesting at the origin. Things get slower and thinner till there's nothing going on at all, I imagine. If you're really down for an adventure, look up helium's phase diagram. Woot.

  33. kevin killeen says:

    Is it dry ice? and there a critical point at the origin? what happens when there's (almost) no pressure and (almost) no temperature?

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