Explanation and evidence for Brownian motion
- An example of Brownian motion is the observed jerky and erratic motion of smoke particles as they are hit by the unseen molecules in the air which can be seen under a microscope
- In 1905, physicist Albert Einstein explained that pollen grains in water were being moved by individual water molecules
- In all cases, larger and visible particles are caused to move by the random bombardment of smaller, invisible particles
- Diffusion occurs much faster in gases than in liquids as gaseous particles move much quicker than liquid particles
- At the same temperature, different gases do not diffuse at the same rate.
- This is due to the difference in their relative molecular masses
- Lighter gas particles can travel faster and hence further, therefore the lower its relative mass the faster a gas will diffuse