Question

is the bottle of perfume is opened in one corner of your room it immediately spreads throughout the room by

Answer 1

........the phenomenon that intermolecular spaces between particles of air is more and force of attraction is less so particles of perfume diffuse easily. 

Answer 2

this is due to the phenomenon of diffusion of molecules like when u cook food in kitchen it spread in whole house in gases diffusion is maximum diffusion means intermixing of substances to create uniformity and it always occur from higher to lower concentrations