The video explains how fluids move due to heating, becoming less dense and rising. This process, known as convection, is exemplified by the heat felt over a radiator. Convection plays a significant role in weather and climate systems.

What happens to a gas or liquid when it is heated?

• It becomes less dense.

• It becomes more dense.

• It evaporates immediately.

• It remains the same.

Why does a hot fluid rise in relation to cooler material?

• Because it becomes less dense.

• Because it becomes heavier.

• Because it loses energy.

• Because it becomes more solid.

How is heat transferred when you feel warmth from a radiator?

• Through reflection.

• Through convection.

• Through conduction.

• Through radiation.

Which of the following is an example of convection?

• Sunlight warming your skin.

• Sound traveling through air.

• A metal spoon heating up in hot soup.

• Warm air rising from a heater.

What role does convection play on a larger scale?

• It determines the speed of sound.

• It influences weather and climate.

• It affects the color of the sky.

• It changes the Earth's magnetic field.