The video tutorial introduces the concept of measuring temperature using mercury, a liquid that expands and contracts with temperature changes. It explains how mercury thermometers are used to measure body temperature. The video also explores how heat causes materials like railway tracks and balloons to expand. Additionally, it covers different temperature scales, including room temperature and normal human body temperature, providing a basic understanding of how temperature affects various materials and systems.

What is the primary reason mercury is used in thermometers?

• It is easy to clean.

• It is cheap.

• It expands and contracts quickly with temperature changes.

• It is colorful.

Why do railway tracks have gaps between them?

• To allow trains to pass smoothly.

• To prevent tracks from expanding and buckling in the heat.

• To save material costs.

• To make maintenance easier.

What happens to air molecules in a balloon when heated?

• They contract and the balloon sinks.

• They become heavier.

• They change color.

• They expand and the balloon rises.

What is considered room temperature?

• 30°C

• 40°C

• 10°C

• 20°C

What is the normal temperature of the human body?

• 25°C

• 30°C

• 45°C

• 37°C

How can a fan help when the temperature is too hot?

• By adding moisture to the air.

• By increasing the temperature.

• By circulating air to bring the temperature down.

• By making noise to distract from the heat.