John Dalton now and then was referred to as the daddy of contemporary atomic theory. In 1803, he speculated that every one atoms of a given element are identical in size and mass. Dalton; chemist reasoned that elements were composed of smaller atoms. This result in the atomic theory of matter.
John Dalton was known as the father of modern atomic theory, because he stated that all atoms of a given element are identical in size and mass. John Dalton reasoned that elements were composed of smaller atoms. This lead to the atomic theory of matter.
A liquid changing to a gas is considered a physical change because it involves a change in one or more physical properties, but no change in the fundamental components that make up the substance.
