"Mass or weight makes no difference since gravity acts on them exactly the same way."

Gravity only acts on 'Mass' - it cannot act on Weight'. It is already PART of 'weight'. :-)

So you know the answer and will elucidate Josepp?

QUOTE
(or mass if you're going get a wild hare up your ass about it)
UNQUOTE

Nope - in Science the correct (and meaningful) term is 'Mass' - only those pretending to know what they are talking about use the term 'Weight' interchangeably - eg the 'weight' on Mars is different from that on Earth - and there is no 'weight' when in space traveling at a constant velocity (not speed!)...

"I'm surprised that you would quote someone as ancient as Lavoisier."

Some people are easily impressed! Mr Lavoisier's work has not yet been obsoleted. The total mass pf combustion products before and after remains unaltered. Unless you can quote something relevant in the Field of Science ... not occult metaphysics and fantasy.