chatelot16 wrote:16 or 20g is a mass not a pressure
to express a pressure you need grams per certain surface area
I never try to guess an incomplete unit, it leads to the worst mistakes: I prefer to question until the one who asks gives the whole info
and again, dear Chatelot, strictly speaking, it is not grams, but Newton which must be used ...
I abstain from intervening in this subject which is a tuft of technical and scientific approximations and imprecisions
Now, if you can help our Grandpa Friend, I'll be happy