|Why does a soda fizz more when you shake it
compared to when you don't shake it?|
|Question Date: 2017-04-19|
The soda will fizz as a result of the unstable
or meta-stable state where CO2 escape
from water or the solution. When you shake the
soda, you will input energy into the system and
also disrupt the meta-stable state, allowing
CO2 to escape much more easily.
So why does CO2 escape from the
water? Normally the water will only dissolve a
very limited amount of CO2. The soft
drink manufacturer intentionally put a lot more
CO2 into water by applying high
pressure at relative low temperature. When the
condition is back to normal, the excessive
CO2 will escape from the cage.
What an exciting question! Soda is fizzy
because the gas inside the soda liquid is trying
to escape. You might notice that if you open a
soda and leave it out for a long time, you don't
have the same fizz as when you just opened it.
This is because all of the gas has escaped the
liquid. When you shake the bottle before its
opened, you make it much easier for the gas to
escape the liquid faster. The gas builds up
pressure inside the bottle like blowing up a
balloon, and opening the soda is similar to
popping the balloon. This results in the fizz! I
hope this explanation helps to answer your
This is a really fun question because it shows us
a lot of really interesting science in a
completely normal environment. The soda companies
add gas to sodas because people like the fizziness
of the drink. The gas that they add is called
carbon dioxide and it is the same gas that all of
us exhale. The soda companies add this gas to
the soda and over time, the gas will try to
escape. This is what you’re seeing when you watch
bubbles rise out of your soda—carbon dioxide
leaving the drink. When you shake a soda, the
liquid loses its grip on carbon dioxide and it is
able to escape much quicker than normal. The
gas leaves as bubbles which appear as fizziness. A
fun follow up question might be: how come a
soda explodes if you shake it too much? The
same principle is at play here—gas leaving the
soda more quickly than it normally does. The only
difference is that if you shake a soda, a ton of
the gas tries to escape all at once and the
pressure causes the soda explode out when opened.
Thank you for the question!
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