Like pumps, there are scores of kinds of mixers, depending on the materials to bemixed. One may wish to mix solids with solids, liquids with liquids, liquids with solids,gases with liquids, and so on.For simple mixing of dry ingredients such as the components that make up abaking powder, a conical blender is suitable. The bowl has a tumbling action and thismay be continued for 10-20 min until the mixture is made homogenous.