Weight Change of Coke Can When Opened: Explained

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When a can of Coke is opened, the initial reading on a sensitive balance increases due to the force exerted by the escaping liquid and CO2 gas. This force creates a temporary net increase in downward pressure on the scale. Once the liquid fully exits the can, its mass decreases, leading to a reduction in the reading. Additionally, as CO2 escapes and the fizzing stops, the overall weight further decreases, potentially influenced by some evaporation. The discussion raises questions about the need for deeper analysis in understanding these weight changes.
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when a can of coke placed in a sensitive balance is opened what happens to the reading?
the answer of this question is given first increases and decreases.
can anyone explain this?
 
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can coke opens and liquid bursts out of it with some acceleration which means: can applies force on liquid which means: liquid applies force on can::

so net force on can increase so does reading

now when the liquid is completely out the mass of can is reduced and so does reading
 
In a less dramatic scenario, the CO2 gas is escaping from the hole in the top and this pressure is causing an increase in downward force. Once the fizzing has stopped and there is less CO2 in there, the final weight will be less (and there may be some water evaporation too.
Should I be doing all this thinking for you? Is this a h/w question?
 
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