[uDevil]

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Here, you say "The force primarily responsible is my throw, as it's the only thing that gave energy to the dice." What is the nature of the force associated with your throw?

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You missed the point completely on that example. May as well say the strong and weak nuclear forces are the forces responsible for everything on Earth as without them the sun wouldn't create carbohydrates and we wouldn't be throwing dice.

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You have made the same point more than once. That I haven't accepted it yet doesn't mean I missed it.

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This isn't about ego. This is such an unbelievably simple phenomena to even a layman that the replies in this thread amazed me. The fact that a physics teacher quoted the second law as being relevant astounded me. The simple answer is this: To a very good approximation, gases are like billions of tiny balls spread far apart relative to their size, each with different velocities. At room temperature they travel at high speed. If you look at it that way, it's exceedingly obvious why diffusion occurs and why you can very quickly smell perfume across a room. And why particular forces aren't relevant to the basic mechanism of diffusion. They teach the kinetic model of gases in 8th grade and it should be common knowledge to anyone who's reached high school.

Anyway, I apologise for being amazed.

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Amazement is coming across as contempt. Calling an idea simple, clear, or obvious doesn't make it so. Contempt for those who fail to understand helps create the lack of understanding that produces the contempt.

What is being taught in schools may resemble the kinetic theory of gases, but it is really a process where students are fed answers and expected to regurgitate them on command. Asking questions is discouraged by the instructor's need to move on to the next topic, his own lack of understanding, or displays of contempt.

That at the end of long exposure to such a process so few people fully understand diffusion seems unsurprising to me. You could ask a whole series of similarly basic questions and find a similar situation.