Why does kilogram of stand take up much less space then a kilogram of feathers?

A kilogram of sand takes up much less space than a kilogram of feathers because sand is denser and has smaller individual particles that pack tightly together. In contrast, feathers are light and fluffy, which means they have a lot of air between them, resulting in a larger volume for the same weight. Thus, the compact nature of sand allows it to occupy less space compared to the bulkier structure of feathers.