Author 'Boucher Marc dit de Meilh' (Id 131728 ) : Bubble or drop. Although for me, there is a difference between the bubble and the drop of water I post this picture in the 'bubble'. The bubble is rather a seething after either chemical or by virtue of a physical phenomenon ... (Bulle amalgamated a material for example ...) The drop is the result of a fall, a thrust (buoyancy, 'a body immersed in a fluid experiences a buoyant force directed from the bottom above, equal to the weight of the displaced fluid. '), a frictional force in its path and a shock to a container such that the product ... In short, I will not go into detail here. A photograph of Mark Boucher told Meilhan.