Editing Mass (section)

=== Mass as distinct from weight ===
According to K. M. Browne: "Kepler formed a [distinct] concept of mass ('amount of matter' (''copia materiae'')), but called it 'weight' as did everyone at that time."<ref name=":0">{{Cite journal |last=Browne |first=K. M. |year=2018 |title=The pre-Newtonian meaning of the word "weight"; a comment on "Kepler and the origins of pre-Newtonian mass" [Am. J. Phys. 85, 115–123 (2017)] |journal=American Journal of Physics |volume=86 |issue=6 |pages=471–74|doi=10.1119/1.5027490 |bibcode=2018AmJPh..86..471B |s2cid=125953814 |doi-access=free }}</ref> Finally, in 1686, Newton gave this distinct concept its own name. In the first paragraph of ''Principia'', Newton defined quantity of matter as “density and bulk conjunctly”, and mass as quantity of matter.<ref>{{Cite book |last=Newton |first=I. |url=https://books.google.com/books?id=Tm0FAAAAQAAJ&pg=PP13 |title=The mathematical principles of natural philosophy |publisher=Printed for Benjamin Motte |year=1729 |pages=1–2 |translator-last=Motte |translator-first=A. |orig-date=1686}}</ref>{{Blockquote|text=The quantity of matter is the measure of the same, arising from its density and bulk conjunctly. ... It is this quantity that I mean hereafter everywhere under the name of body or mass. And the same is known by the weight of each body; for it is proportional to the weight.|author=Isaac Newton|title=Mathematical principles of natural philosophy|source=Definition I.}}