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This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.
This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.
An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.
Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.
In alkaline batteries electric current is generated by electrochemical reactions
Addition is a reaction in which the molecules of two or more substances unite without the formation of a by-product.
The solution of hydrogen chloride in water is called hydrochloric acid.
During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.
Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.
Ammonium chloride is the result of the reaction of ammonia and hydrogen chloride
The dissolution of zinc in hydrochloric acid produces hydrogen gas.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.
Common salt is dissolved by water: polar water molecules form a coat around the ions.
Polymerised ethylene is known as polyethylene, a type of plastic.
An entertaining animation to practise orientation using a map.
The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.
The most important Neoclassicist building in France, completed in 1791, became the final resting place of many of France´s greats.
The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.
The length of the metal frameworks of bridges change when the temperature changes.
Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.
Submarines submerge and surface by changing the average density of the hull.
Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.