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Capacitors store electrical energy in the form of electric charge.


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

Continental drift on a geological timescale

The Earth's continents have been in constant motion during the history of the planet.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Melting and freezing

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

Aerodynamic lift

High speed generates a lift on airplane wings due to their asymmetrical profile.

Submarine operation

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

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

Phases of the Moon

During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.


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


Possible traces of water and life are sought on Mars.

Wankel engine

A type of rotary engine of high efficiency


Neptune is the outermost planet of the Solar System, the smallest of the giant planets


Saturn is the second largest planet in the Solar System, easily recognisable by its rings.


Mercury is innermost and smallest planet of the Solar System.


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

Formation of hydrogen molecules

Hydrogen atoms within hydrogen molecules are held together by a covalent bond.

Warm front, cold front

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

Space Shuttle

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

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