Question

Why weight of paint decreases after heating?

Answer 1

As a rule, when a liquid is heated, its temperature increases naturally. This results in the density and viscosity of the liquid getting reduced. As a result, the liquid becomes thinner and less heavy.

Paint is a liquid and the above rule applies here also. Thus, when paint is heated, its weight becomes lesser than at normal temperature.

Answer 2

Because the thinner present in the paint . When paint heated the thinner is dislocated in the environment . Thinner is volatile .