• 0 Posts
  • 4 Comments
Joined 1 year ago
cake
Cake day: June 15th, 2023

help-circle

  • What the actual fuck… and that too from apnews?

    Now only if those “researchers” looked even further back, they would have found that ultimate building blocks of any coffee, like electrons and up & down quarks came into existence around 13.8 billion year ago (or may be ~28 billion year ago as claimed by some new research), and our universe may be a part of infinite multiverse that may have existed forever.

    So wouldn’t it be even bigger headline that coffee has existed forever :)


  • According to this physics.stackexchange.com answer:

    "I suppose the surprising thing is why the atmosphere doesn’t all fall immediately to the Earth’s surface to form a thin dense layer of air molecules.

    The reason this doesn’t happen is that air molecules are all whizzing around at surprisingly high speeds - typically hundreds of metres per second depending on the temperature.

    The air molecules bash into each other and knock each other around, and the air molecules near the ground bash into the air molecules above them and stop them falling down."

    Detailed explanation from another answer:

    "The key ingredient is temperature.

    If it were zero then all the air would indeed just fall down to the ground (actually, this is a simplification I’ll address later).

    As you increase the temperature the atoms of the ground will start to wiggle more and they’ll start to kick the air molecules giving them non-zero average height.

    So the atmosphere would move a little off the ground. The bigger the temperature is the higher the atmosphere will reach.

    Note: there are number of assumptions above that simplify the picture. They are not that important but I want to provide a complete picture:

    1, Even at the zero temperature the molecules would wiggle a little because of quantum mechanics

    2, The atmosphere would freeze at some point (like 50K) so under that temperature it would just lie on the ground

    3, I assumed that the ground and the atmosphere have the same temperature because they are in the thermal equilibrium; in reality their temperatures can differ a little because of additional slow heat-transfer processes."