Heisenberg's uncertainty principle states that more precisely we measure the position of a particle, less precisely you can know its velocity and vice-versa. It also states that the product of uncertainty in measurement of velocity and uncertainty in measurement of position, is significant to micro particles having a very high speed. The mathematical expression of the law is given below: ∆x×∆y≥
h
4π
∆x= change in position of the particle ∆y= change in momentum of particle h= Planck's constant