when the particle do not collide with the wall of the container or with the other particles is called free settling the suspended particles in the medium do nor effect it
and when the particle collide with the other particles and with the wall of the container an d collides with the suspended particles is called hindered settling
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Gases cannot form a free surface on their own. However, gases do have a free surface at the boundary between gas and liquid, such as the free surface of the sea, or the boundary between the liquid of a soft drink and each carbon dioxide bubble rising in it.
sterile water is just free from microrganisms while pyrogen free water is specifically free from those orgainsms which cause fever.
The difference between free fall and terminal velocity i that free fall is when an object is falling or descending through the air with little air resistance or drag. Terminal Velocity, on the other hand is when the resistance of air and the force of gravity balance each other out causing the object to reach a constant velocity. .
Some relations. Newton's laws: F=ma N=mg Free fall: V=gh (free fall) Impact: m1v1+m2v2=m1u1+m2u2 (unelastic impact) Energy: Ek=(1/2)mv2 Ep=mgh
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