The speed at which a particle settles in the atmosphere is called the terminal settling velocity (V) and approaches a constant value as a result of the balance between the acceleration due to gravity and the atmospheric drag force.
|For simple spheres this speed can be calculated using Stokes Law. Drag the mouse over the terms in the equation below to learn more about them.|
|How fast do they fall??|
|Place your mouse over any the particles below to see how fast they would fall through the atmosphere (~10 km height).|
|5 cm||1 cm||0.1 cm||0.01 cm|
|Terminal settling velocity=|