How Carr's index be calculated?

Carr's index, also known as the powder flowability index, is calculated using the formula: CI = (Tapped Density - Bulk Density) / Tapped Density x 100. To determine it, first measure the bulk density of the powder by gently pouring it into a graduated cylinder and recording the volume. Then, tap the cylinder to achieve a more compact packing and measure the tapped density. The difference between the tapped and bulk densities, expressed as a percentage of the tapped density, gives the Carr's index, indicating the flowability of the powder.