Which factor typically decreases the solubility of gas in a liquid solution?

The factor that typically decreases the solubility of a gas in a liquid is increased temperature. At higher temperatures, gas molecules have more kinetic energy, which causes them to escape from the liquid more readily. This means that fewer gas molecules will remain dissolved in the liquid, leading to decreased solubility.

Moreover, the relationship between temperature and gas solubility is explained by Henry's Law, which states that the solubility of a gas in a liquid is inversely proportional to the temperature. Thus, when the temperature rises, the solubility of the gas decreases.

The other options, such as increased pressure, generally promote the solubility of gases in liquids, following Le Chatelier's principle. Decreased particle size and decreased volume do not directly influence the solubility of gases in a significant way relative to temperature and pressure effects in this context.