Misconceptions and Properties of Materials

The video debunks five common myths in material science. It clarifies that radioactive elements do not glow green, spider silk is not stronger than steel, stainless steel can be magnetic, plastic bottles do not release dioxins when frozen, and glass is not a supercooled liquid but a solid. Each myth is explained with scientific reasoning and evidence.

What is a common misconception about radioactive elements?

• They glow green naturally.

• They are all man-made.

• They are not metals.

• They are always dangerous to touch.

Why do some materials associated with radioactivity appear to glow green?

• Due to the presence of chlorophyll.

• Due to the natural color of uranium.

• Because of phosphorescence from a coating.

• Because they emit green light naturally.

What is the truth about the strength of spider silk compared to steel?

• Spider silk and steel have the same strength.

• Spider silk is stronger than some types of steel.

• Spider silk is weaker than all types of steel.

• Spider silk is stronger than all types of steel.

What property makes spider silk remarkable?

• Its toughness.

• Its weight.

• Its color.

• Its temperature resistance.

What is a common misunderstanding about stainless steel?

• It is always non-magnetic.

• It is always heat-resistant.

• It is always lightweight.

• It is always rust-proof.

What determines the magnetic properties of stainless steel?

• Its temperature.

• Its color.

• Its crystal structure.

• Its weight.

What is the myth about plastic water bottles and freezing?

• They release dioxins when frozen.

• They become toxic when frozen.

• They change color when frozen.

• They become heavier when frozen.

Why is the myth about glass being a supercooled liquid incorrect?

• Glass is a liquid at all temperatures.

• Glass is a solid at room temperature.

• Glass is a gas at high temperatures.

• Glass is actually a crystalline solid.

What is the flow rate of glass at room temperature?

• One millimeter per year.

• One meter per year.

• One nanometer per billion years.

• One centimeter per century.

What phenomenon describes the slow deformation of solids like glass?

• Melting.

• Creep.

• Condensation.

• Evaporation.