Jupiter is the largest planet of the Solar System, it has two and a half times the mass...

Melting and freezing

During freezing hydrogen bonds are formed between water molecules resulting in a crystal...

Aerodynamic lift

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

Submarine operation

Submarines submerge and surface by changing the average density of the hull.


Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).


Uranus is the 7th planet from the Sun, a gas giant.

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two...


Capacitors store electrical energy in the form of electric charge.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical...

Space Shuttle

The Space Shuttle was a manned, reusable spacecraft operated by NASA.

Torsion balances

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

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...

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...

Dynamo (basic)

A dynamo converts mechanical energy into direct current.

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