Question

what is new theory for motion in particles ??? ​

Answer 1

Answer:

Particles in both liquids and gases (collectively called fluids) move randomly. This is called Brownian motion. They do this because they are bombarded by the other moving particles in the fluid. ... This confirmed that atoms and molecules did exist, and provided evidence for particle theory .

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Answer 2

Answer:

Mathematicians have developed a new theory to explain the strange, loopy motions seen in 'passive' particles immersed in 'active' fluids. ... Einstein's theory of Brownian motion, which describes the random movement of particles in fluids, is widely used to model randomness throughout science.