# The weight of a 2cc glass pharmaceutical flame sealed ampoule? [closed]

This is one of the flame sealed type whose neck is broken before use. There seems to be lots of info on dimensions but none with regard to weight.

## closed as too broad by Jan, Todd Minehardt, Wildcat, M.A.R. ಠ_ಠ, bonOct 14 '15 at 17:54

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• Break one and weigh. Note that there is not much sense in weighing to a greater accuracy than grams because every ampoule will have a different weight; these weights will differ at least by tens of milligrams if not by hundreds. – Jan Oct 14 '15 at 14:55
• Problem is that I don't have one, and I do not want to buy a big batch just to weigh one. – Dirk Bruere Oct 14 '15 at 15:14
• Why do you need its weight then? – Jan Oct 14 '15 at 15:47
• To attach to a microbalance that is mass limited and to weight in gas to determine gas density. Volume would be found by calibrating with gases of known density at a given temperature – Dirk Bruere Oct 14 '15 at 15:49

I grabbed 10 empty, unsealed ones and threw them on the analytical balance and got mean: 2.4071 g, s.d.: 0.01264 g for Wheaton amber glass pre-scored vials (part number 176796). The variation between vials isn't too bad, but I don't know if they can be filled and sealed consistently enough to determine gas density like that to any useful precision and other brands may be better or worse.

• $+1$ for ‘I don't know if they can be filled and sealed consistently enough to determine gas density like that to any useful precision’ – Jan Oct 14 '15 at 16:58
• Think buoyancy... – Dirk Bruere Oct 14 '15 at 20:51