When a glass of Lager has been poured, why do the bubbles always come from the bottom of the glass?

Why don’t the bubbles come from all over the glass?

RollingSands
on February 8th, 2012

in newish glasses, the is a widget type of thing at the bottom, little indents in the bottom of the glass, which when the bubbles go down the glass it sends them back up, it does it to maintain a head on your pint
Dolphinswimmer
on February 8th, 2012

Epervesence. CO2
Erin
on February 8th, 2012

gravity. a gas is less dense than a liquid. Hence it goes up.
StarGirl
on February 8th, 2012

Most new glasses have what are called diffuser etchings in the bottom that cause the bubbles.These tend to keep a half decent head on the pint..
If you look closely approx 90% of the bubbles will be coming from the etched pattern on the bottom of the glass..
Cashsplash
on February 8th, 2012

because they all had a meeting before and decided to come from the bottom.
SkateRForeveR
on February 8th, 2012

because that is the liquid which has entered the glass first and the air in the remainder of the liquid you are pouring in mixes with the first liquid lot of liquid and GOD,your confusing me now,but do you get what i mean?