States of matter in physics are the distinct forms that different phases of matter take on. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma. Diffusion is defined as spontaneous mixing up of molecules by random motion and collisions to form a homogeneous mixture. Historically, the distinction is made based on qualitative differences in properties of Matter.
which help?
wo vapour pressure wale topic me condensation ki definition ke niche likha hua hai