Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Aerodynamic lift

Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.


The process of the decay of unstable nuclei is called radioactivity.

The reflection and refraction of light

A ray of light is reflected or refracted at the boundary of two mediums with different refractive indices.

Stirling engine - hot-air engine

Stirling engines are also known as external combustion engines. Unlike internal combustion engines (e.g. Otto-engine), here combustion takes place outside...

p-V-T diagram for ideal gases

The relationship between the pressure, volume and temperature of ideal gases is described by the gas laws.

Satellite navigation, GPS

The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.

Moon radar experiment (Zoltán Bay, 1946)

In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.

Simple harmonic motion and uniform circular motion

Simple harmonic motion can be considered to be the one-dimensional projection of uniform circular motion.

Suction pumps and direct action pumps

Direct action pumps and suction pumps are among the simplest water pumps.

Light and shadow

By varying the position of the light source, you can examine the shades projected onto the planes of the coordinate system.

Torsion balances

A force can be measured by measuring the twisting of the torsion wire in a torsion balance.

Dynamo (basic)

A dynamo converts mechanical energy into direct current.

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