Physics Why can blowing hot air with a hair dryer make hair dry quickly?

Because the evaporation speed is related to the temperature of the liquid, the evaporation area and the airflow speed on the surface of the liquid.

The higher the temperature, the faster the evaporation; The larger the evaporation area, the faster the evaporation; The faster the air moves, the faster it evaporates.

Hair dryer can increase the temperature of water in hair and speed up the air flow, so it can speed up the evaporation of water.