Thermal Expansion of Metals

The video demonstrates thermal expansion using a metal ring and sphere. Initially, the sphere passes through the ring at room temperature. After heating, the sphere expands and cannot pass through the ring, illustrating the concept of thermal expansion.

What is the demonstration in the video about?

• Thermal expansion

• Chemical reactions

• Electric circuits

• Magnetic fields

What objects are used in the demonstration?

• A metal ring and a metal sphere

• A plastic ring and a metal sphere

• A metal ring and a plastic sphere

• A plastic ring and a plastic sphere

At room temperature, what happens to the metal sphere?

• It easily passes through the ring

• It gets stuck in the ring

• It breaks the ring

• It changes color

What happens to the metal sphere when it is heated for a few minutes?

• It melts

• It remains the same size

• It contracts

• It expands

After heating, can the metal sphere pass through the ring?

• Yes, it passes through easily

• No, it breaks the ring

• No, it won't go through the ring

• Yes, but with difficulty