the.com/conservation of mass
Matter never leaves the party, it just rearranges its costume.
means In any closed system, the total mass stays the same no matter what chemical or physical changes happen to it — matter can change form but isn't created or destroyed.
from The phrase joins 'conservation,' from Latin conservare 'to keep, preserve,' with 'mass' from Latin massa 'lump, dough.' The idea itself crystallized in the late 1700s when Antoine Lavoisier carefully weighed substances before and after chemical reactions in sealed vessels, showing the total weight held steady — a founding moment of modern chemistry. Earlier thinkers had floated similar notions, but Lavoisier's precise, repeatable measurements gave the principle its scientific backbone.
- true origin
- Lavoisier weighed stuff before guessing, revolutionary at the time
- the catch
- Einstein showed mass and energy swap, so it bends
- burning wood
- ash is lighter because gases floated off, not vanished
- everyday proof
- ice melting weighs exactly the same as the ice