Answer:
Simple diffusion
Step-by-step explanation:
Simple diffusion is basically the diffusion of substances through a membrane without needing the help from other substances, from the area of higher concentration to the area of lower concentration.Also known as passive diffusion.
Simple diffusion does not require energy. Instead, it happens by random motion. Random motion is defined as movement that occurs by chance because there is no order or regular system by which the movements of the particles shift in a solution or gas.
Therefore the smell of perfume spilled at the corner of a large hall spreads to all other corners by simple diffusion.