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This video explains the role of air, buoyant force, and thermal expansion in the operation of a hot-air balloon. It also presents how an airship works, showing that it is propelled by a propeller while its lift is provided by helium.

This video explains the principles of keeping things cool using a refrigerator and also describes how an air conditioner works.

This video explains how friction is created when two surfaces come into contact. It shows that the more the surfaces are pressed together, the greater the friction, and demonstrates how friction is used in braking to control the speed of a cart.

This video explains how vibrations produce sound waves and shows how they can bounce off solid objects to create an echo. It also introduces the main parts of the ear and their role in hearing, as well as how a microphone works.

This video presents the principle of density, which is the amount of matter in a given volume. It also covers the concepts of immersion and buoyancy.

This video introduces leaf springs and coil springs, as well as the concept of tension in a spring. It demonstrates how these springs store and release energy in different mechanisms.

This video explains how electrons, negatively charged particles found in atoms, are the basis of electricity. It introduces static electricity and electric current by showing how the movement of electrons creates electrical phenomena.

This video explains how liquids and gases exert pressure and shows how this principle is used in everyday objects and devices, such as a drinking straw, a vacuum cleaner, a pneumatic hammer, and hydraulic systems.

This video explains how sound waves produce sound. It shows how the volume of air in a bottle affects pitch and introduces how wind and string instruments produce sound.

Out with the old, in with the new! Bertille and Barnabé set out to modernize the Mammoth Inn they had just inherited. They equip it with the most modern and sophisticated devices: alarm systems, smoke detectors, sliding doors and metal detectors soon replace the mammoths that used to be the picturesque charm of the place. This does…

On the island of the mammoths, the 'telephone stones' turn out to be a somewhat hazardous and sometimes even dangerous means of communication! After the inventor's explanations, the islanders quickly adopted the telephone. This electric telephone sends signals that travel through electrical wires and are eventually…