Answer
The solubility of a gas is directly proportional to pressure.
Work Step by Step
The solubility of a gas is directly proportional to the pressure. This is called Henry's Law.
It can also be stated as- The mass of the gas dissolved per unit volume of the solvent is directly proportional to the pressure of the gas.
ie, $m=Kp$
Here,
$m=$ mass of gas
$p=$ pressure of the gas
$K=$ Henry's law constant
When we open a soda bottle, the pressure above the dissolved gas $(CO_{2})$ decreases. From Henry's Law, we know that the solubility of a gas is proportional to pressure. Thus solubility of $CO_{2} $ decreases and it fizzes out.
