Meteorological instruments

This animation demonstrates instruments used to examine atmospheric phenomena.

Oil refinery

The products of oil refining include diesel oil, petrol and lubricants.

The Channel Tunnel

The Channel Tunnel is a 50.5 km long railway tunnel between the United Kingdom and...

House without carbon-dioxide emission

The design and structure of modern houses play an important role in environmental protection.

Ferrous metallurgy (intermediate)

Raw iron is produced from iron ore in iron smelters.

Solar power station

Solar power stations convert solar energy into electricity.

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Sewage treatment plant

Treated sewage water can be used in agriculture and industry.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the...

Medieval keep

Keeps were typical buildings in the Middle Ages, also built independently from castles.

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

Cube (exercises)

Edges, diagonals and faces of a cube can be identified by its vertices.

Tidal power station

Tidal power stations utilise the daily fluctuation of the water level for producing...

Non-orientable surfaces

The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one...

Medical conditions of the spine

Scoliosis is a medical condition in which a person's spine has a lateral deviation.

Conic sections

The conic section is a plane curve that is created when a right circular cone is...


Enzymes are protein molecules catalysing biochemical reactions. Their activity can be...

Open-cast mine

As opposed to underground mines, in open-pit mines the layers covering coal are removed,...

Colonisation and decolonisation

The colonising powers´ colours were wiped off the map by the nations fighting to regain...

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