Principle:
The air movement is used for mixing powders. Air is admitted at its base at an angle which gives tumbling action and spiral movements to the powder. Thus mixing is achieved.
Construction:
It consists of stationary vessel which may be horizontal or vertical which is made up of stainless steel.
A wire mesh is placed at the bottom of the vessel which acts as support for placing the materials.
Air is allowed from beneath the mesh and circulated by using a fan.