Originally Posted by R8ers
When the yeast is eating it produces co2 the air lock will release that co2 a few times an hour...
The air lock is basically an upside down cap that is under water that lets air escape but won't let air in.
I used to make beer 15 or so years ago... I may get back into it.
When I brew my beer, the gas bubbles out, but it never stinks at all.