Gimme that now

But you also breathe out when you talk, so it would need a way to stay in the body despite of breathing.

I would guess so... but it would be easier than an oxygen tank maybe?

I read an article about this (can't find it now) where they would put the crystals in an oxygen tank roughly the size of a 21oz bottle. Then it would slowly dissipate the oxygen from the tank. The tank being a lot smaller and lighter and allow for longer periods of being underwater.

Oh.

Thanks fire_is_hot!

Exactly correct

if someone wants a source and some explanation

Here's the primary source: http://pubs.rsc.org/en/Content/ArticleLanding/2014/SC/C4SC01636J#!divAbstract

Well we are pretty warm.

You obviously haven't met me and seen my soul then.

You put it in a little tank and heat it and you have oxy for 20 hours?