Gas bubbles have been found to exhibit behavior similar to fluid spheres, and dimensionless numbers like Re and We are commonly employed to characterize both the motion of liquid in the gas phase, and the motion of gas bubbles in a liquid phase. Additionally, both liquid drops in a gas and gas bubbles in a liquid form gasliquid interfaces, leading to surface tension effects. Gas bubbles also experience viscous drag from the surrounding liquid, akin to the way liquid drops experience it in a gas phase. The density difference between the liquid and gas should be considered when defining dimensionless numbers. Therefore, the equations for liquid drops may also be applied to gas bubbles.