However, change in fluid velocity or dissolved gas content had little effect on the bubble size.
The number counts of microns size bubbles were found to increase with increasing the dissolved gas content.
At a given fluid flow velocity, reducing the dissolved gas content by heating the liquid for 2 h at 80 °C reduced the number counts of micron size bubbles while saturating the liquid with CO2 led to a significant increase in the number counts of micron size bubbles.
The time required to achieve solubility equilibrium depends on the dissolved gas content and the water flow rate; we determined an e-folding response time of 9-12 min, under air-saturated conditions and with a flow rate of 2 L/min.
Indeed, compared to their marine relatives, freshwater flatworms are regularly exposed to a much wider range of variation in temperature, salinity, pH, and dissolved gas content (Hutchinson, 1957), facts which would seem to facilitate the colonization of an internal environment.
Both solubility and clathrate hydrate formation can modify the dissolved gas content of ice-covered lakes on Earth (Mousis et al., 2013) and are likely of importance in icy satellites bearing interior oceans or seas.
