Conductores térmicos

The video tutorial explains how metal conducts heat efficiently due to its free-moving electrons, which transfer thermal energy quickly. It discusses the concept of thermal expansion, where heated atoms vibrate more, causing metals to expand. This principle is applied in structures like railroad tracks to accommodate expansion. Conversely, when metals cool, they contract, a process known as thermal shrinkage. The tutorial also covers how heat is transferred from a hot pan to the surrounding air, leading to cooling and contraction.

What role do electrons play in the thermal conductivity of metal?

• They contract the metal when cooled.

• They create small holes for expansion.

• They move freely to transfer heat quickly.

• They vibrate to transfer energy.

What happens to atoms in metal when they are heated?

• They vibrate more intensely.

• They contract.

• They move freely.

• They stop moving.

Why do large metal structures like railroad tracks have small gaps?

• To allow for thermal shrinkage.

• To prevent rusting.

• To accommodate thermal expansion.

• To reduce weight.

What is the process called when metal contracts as it cools?

• Thermal conduction

• Thermal vibration

• Thermal shrinkage

• Thermal expansion

How does a pan lose heat to the surrounding air?

• Through thermal expansion.

• By creating small holes.

• Through the vibration of atoms.

• By the movement of electrons.