9.24 - Molecules in a Container Gas Takes shape Fills It...

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1 Gas Takes shape Fills It Flows Liquid Takes shape May not fill Flows Solid Retains shape May not fill Doesn’t flow Molecules in a Container Can be the same molecules! Gas Takes shape Fills It Flows Liquid Takes shape May not fill Flows Solid Retains shape May not fill Doesn’t flow Molecules in a Container Density: solid, liquid >> gas Compressibility: gas >> liquid >/= solid Space between atoms/molecules Motion of Molecules All are dynamic! Solid -- molecules vibrate Liquid -- they Gas -- molecules translate inertially (diffuse at long times)
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2 Collisions Collision rate: liquid >> gas Mean free path: gas >> liquid Constant speed From the Demo • Gases diffuse • They diffuse at different rates • They do not diffuse through the tube Elementary Physics Momentum ~ mass • velocity (kg•m/s) Force = Δ (momentum)/ Δ (time) = mass• Δ ( velocity)/ Δ (time) = mass•acceleration (kg•m/s 2 ) Newton Newton’s 2nd Law
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9.24 - Molecules in a Container Gas Takes shape Fills It...

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