Physicists and astronomers study the ways in which various forms of matter and energy interact. Theoretical physicists and astronomers may study the nature of time or the origin of the universe. Some physicists design and perform experiments with sophisticated equipment such as particle accelerators, electron microscopes, and lasers.
Nanotechnology can be defined as a branch of science in which we study about the matter at molecular, atomic, and supramolecular level.
Stoichiometry is the calculation of the relative quantities of the reactants and the products in chemical reactions. Stoichiometry is based on the law of conservation of mass where the sum total of all the masses of the reactants is equal to the total mass of the products