a form of matter that has a definite composition and distinct properties
a homogeneous collection and has associated parameters such as mass, volume, temperature and specific volume that are constant throughout the substance
a substance that contains only one kind of matter; elements and compounds are pure substances raw materials processed material that can be converted by manufacture, processing, or combination into a new and useful product
matter with a constant molecular formula free of "contamination" by other elements.
A substance—either an element or compound—that has an unvarying composition. This means that by changing the proportions of atoms, the result would be an entirely differentsubstance. Compare with mixture.