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.
Punjab Chemistry Online 9th Class Test Lesson 5 Physical States of Matter
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