The working of a spin drier is based on centrifugal force, exerted by all rotating bodies. When the drier rotates at high speed, the wet clothes are thrown outward by the centrifugal force. The drier's drum is perforated and permits water to fly out through the holes. Clothes, being much larger in size, are retained within the drum. What you get ultimately is clothes minus the moisture (water) that they contained before the drier started rotating.