Question

will you please tell me how to balance an equation in physics

Answer 1

Just now suppose.
KClO3=KCl+O2
now we can balance
in the given formula mean the equation given after = is having only 2 oxygen but before =it is 3 oxygen.
then: 2KClO3=2KCl+3O2

Answer 2

here is how to balance an equation in physics:-
 first write down the equation (skeletal)
 pen down the elements present in the reactant and product
 then try to make the atoms at each side equal by hit and trial method
  finally you will get an balanced equation.