How Silly String Saves Lives

What is the scientific definition of foam?

• A liquid with large air bubbles.

• Any liquid or solid with tiny pockets of gas inside.

• A solid material that is very soft.

• A type of gas that is very light.

What is the main material that makes up the 'string' part of Silly String?

• Metal

• Rubber

• Acrylic resin

• Water

What type of gas was used as a propellant in Silly String in the 1970s that was later banned due to its environmental impact?

• Hydrofluorocarbons

• Oxygen

• Freon-12 (a chlorofluorocarbon)

• Nitrogen

What is the primary role of surfactants like sorbitan trioleate in Silly String?

• To add color to the string.

• To make the string stronger.

• To stabilize air bubbles and create a fluffy, sticky foam.

• To make the string smell good.