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The existence of Brownian motion gives us two conclusions about the nature of matter : That matter is made up of tiny particles. That the particles of matter are constantly moving.

The existence of Brownian motion gives us two conclusions about the nature of matter : That matter is made up of tiny particles. That the particles of matter are constantly moving. Correct Answer Both are correct

The correct answer is 3 i.e. Both are correct.

  • Brownian motion :
    • The best evidence for the existence and movement of particles in liquids was given by Robert Brown in 1827.
    • It was named after his name who first observed the phenomenon of pollen gains.
    • He suspended extremely small pollen grains in water. 
    • On looking through the microscope, it was found that the pollen grains were moving rapidly throughout the water in a very irregular way.
    • It was observed that warmer the water, the faster the pollen grains move on the surface of the water.
    • Water is made up of tiny particles that are moving fast.
    • The pollen grains move on the surface of the water because they are constantly being hit by after moving particles of water.
    • This random motion of visible particles caused by the much smaller invisible particles of water is an example of Brownian motion.
  • Brownian motion in gases : 
    • Sometimes, when the beam of sunlight enters a room, we can see tiny dust particles suspended in the air which is moving rapidly.
    • The tiny dust particles move here and there because they are constantly hit by the fast-moving particles of air.
    • The zig-zag movement of the small particles suspended in a liquid (or gas) is called Brownian motion.
  • The existence of Brownian motion gives us two conclusions about the nature of matter :
    • That matter is made up of tiny particle, and
    • That the particles of matter are constantly moving.

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