Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in...

2-deoxy-beta-D-ribose (C₅H₁₀O₄)

A component of DNA, it contains one less hydroxyl group than β-D-ribose.

Hexane (C₆H₁₄)

The sixth member in the homologous series of straight-chain alkanes.

Bromofluorochloromethane (CHClBrF)

The molecule has two enantiomers: stereoisomers that are mirror images of each other and...

Water (H₂O)

Water is a very stable compound of hydrogen and oxygen, vital for all known forms of...

Leonardo da Vinci’s inventions - Flapping wing (1487–1489)

Leonardo based the design of the flapping wing on birds' wings and a faulty hypothesis.

Leonardo da Vinci’s inventions - Armoured car

The design for the armoured car features the most important military requirements:...

Lake steamer (1846)

The first paddle steamer in Hungary entered service in 1846.

Phosphoric acid (H₃PO₄)

It is also used as a food additive, limescale and rust remover.

Aniline (C₆H₅NH₂)

The simplest aromatic amine. Its scientific name is phenylamine.

Methylamine (NH₂CH₃)

The simplest primary amine.

1,1,2,2-tetrafluorethylene (C₂F₄)

Colourless, odourless gas, the monomer of teflon.

Leonardo da Vinci’s inventions - Aerial screw (around 1489)

The polymath thought that if a screw-like structure can rotate fast enough, it will...

Leonardo da Vinci’s inventions - Mechanical wing (1493–1495)

The mechanical wing is one of the masterpieces among Leonardo's sketches related to aviation.

Leonardo da Vinci’s inventions - Swing bridge (1487-1489)

Leonardo's creative legacy also includes several projects related to bridges. This...

Leonardo da Vinci’s inventions - Siege engines

Leonardo was not only a master artist, but also an accomplished military engineer.

Sulphur trioxide (SO₃)

One of the oxides of sulphur, forms sulphuric acid with water.

Designing kitchen furniture - spatial coordinate system

Practising the use of the spatial coordinate system with the help of a computer-designed...

Phenol (C₆H₅OH)

The simplest of the aromatic hydroxy compounds.

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