These latter blocked up the tube much in the same way that ... Trouton found that when a bubble of oil was allowed to rise through water with which one fifty-thousandth part of caustic soda ...

The motors, which are shaped like a tube and made from silicon and manganese dioxide, are propelled by bubbles released ...

But the details here include separate tubes for each bubble ... we definitely also love the jumpy effect in the water version when a new bubble is introduced and the air pressure settles into ...