Methods Of Separation Of Substances Under Dry Conditions Different methods are used for separating different substances that are mixed together such as handpicking, threshing, winnowing and sieving. Threshing Grains or seeds of plants like rice and wheat serve as sources of food. The flour (atta) that is used for making chapattis is made from wheat grains. After these crops … [Read more...] about Methods Of Separation Of Substances Under Dry Conditions