Such systems are often called bubble tube or dip tube systems, the former name being
appropriately descriptive for the way purge gas bubbles out the end of the tube as it is submerged
in process liquid. A very simple bubbler system may be simulated by gently blowing air through a
straw into a glass of water, maintaining a steady rate of bubbles exiting the straw while changing
the depth of the straw’s end in the water