Small Metal Ampoules

[Barquentine]

I sometimes see these discarded in the street. Any ideas what they are? They are sort of grey in colour.

[Hopkirk]

Laughing gas, or nitrous oxide.

http://www.bbc.co.uk/news/uk-england-london-28651063

[mibn2cweus]

Whipped cream charger - http://en.wikipedia.org/wiki/Whipped-cream_charger

[ummmm]

I would guess laughing gas. It seems to be the new craze with teenagers.

[mikey4444]

Part of our ever-increasing drug culture.

[Barquentine]

Thanks - that's what they are. Mystery solved.

[AB Editor]

They may also be CO2 capsules for gas powered bicycle pumps. It would be a bit naughty to litter them about however...