Co2 dissolving and pressure.

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RustyHorn

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As Co2 dissolves into the liquid, does it change the pressure in the keg?
I applied X psi to my keg and left it at 2.2°c for a day. When I reattached my gasline, the regulator showed a drop of 5 psi. I can't find any leaks and have used two different spear heads so I'm ruling out a leak.

Thanks.
 
Yes, without getting too technical my understanding of it is that the gas dissolves into the liquid, removing gas molecules from the head space and dropping the pressure until the pressure in the head space essentially equals the pressure/molecules escaping the liquid. The liquid holds the gas and so the gas is not free and can not press on your regulator showing a drop in pressure. Ideally when you set your pressure the amount in the beer is the same as the amount of pressure in the head space. Colder liquid holds more gas than warmer liquid so if you let your beer warm the pressure will go up.
 
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