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Thread: What happened here?

  1. #21
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    Quote Originally Posted by GoldDigger View Post
    I do not see the physics or thermodynamics to support that.
    Before it comes to a boil, why is water hotter at the top than it is at the bottom?
    I will have achieved my life's goal if I die with a smile on my face.

  2. #22
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    Quote Originally Posted by Smart $ View Post
    Before it comes to a boil, why is water hotter at the top than it is at the bottom?
    And I know what you're going to say... that's convection... and it is. But at what point is there no movement in a solid?
    I will have achieved my life's goal if I die with a smile on my face.

  3. #23
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    Quote Originally Posted by Smart $ View Post
    And I know what you're going to say... that's convection... and it is. But at what point is there no movement in a solid?
    The answer is that in a solid there is vibrational motion, but no bulk motion except on a geological time scale. Which is not relevant here.

    Sent from my XT1585 using Tapatalk

  4. #24
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    Quote Originally Posted by Smart $ View Post
    Before it comes to a boil, why is water hotter at the top than it is at the bottom?
    If heat source is at bottom, water at bottom is hotter than at top before it boils. Once it starts boiling, temperature is same throughout water. So the heat source must be at top of water surface.

  5. #25
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    Quote Originally Posted by Sahib View Post
    If heat source is at bottom, water at bottom is hotter than at top before it boils. Once it starts boiling, temperature is same throughout water. So the heat source must be at top of water surface.
    I posted off the cuff. You are correct if heating the water faster from the bottom than gravity brings the hotter water to the top. My statement was more generalized, heat applied from all directions...
    I will have achieved my life's goal if I die with a smile on my face.

  6. #26
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    Quote Originally Posted by Smart $ View Post
    Before it comes to a boil, why is water hotter at the top than it is at the bottom?
    Because hotter water is less dense than cold water.

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