Bubble-ology

CONCEPTS: Bubbles are made of very thin but strong films of detergent solution. Because they are so thin light reflected from the inside and outside of the film interfere with each other to give the film color until the film becomes so thin that all interferenc is destructive and the film appears black. This phenomenon can be observed with half-spherical bubbles blown on tabletops or as giant bubbles float through the air. Giant bubbles show most clearly the oscillation of bubble shape, the shifts of interference-induced colors, and even the tendency of very elongated bubbles to fission into two more spherical ones.

THE ACTIVITY: Older children (grades 4-5) will learn to finger crochet to make their own bubble makers before going outdoors to try their hands at making consistent giant bubbles with bubble-makers we supply. Younger children will concentrate on making bubbles. All will observe bubble motion, colors, and shape, and discuss possible investigations to make stronger bubbles.

Materials and facilities needed to be supplied by the class: A large grassy area (not paved because bubble solution can make paved surfaces very slippery) for bubble making and watching; water to dilute bubble solution; sink in which to wash out bubblemakers

Wisconsin Science Standards:

Science Inquiry: C.4.2; C.4.4

Physical Science: D.4.4; D.4.6; D.4.7

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