Cấu hình của etan

Cấu hình so le của etan ổn định hơn cấu hình che khuất.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Những ngày đầu đến trường

Tìm hiểu khái niệm về màu sắc, con số, chữ cái và hình học qua các trò chơi

Typical dwelling types

Every era and every culture has specific residential buildings.

Battleship (HMS Dreadnought, 1906)

HMS Dreadnought revolutionised battleship-building in the 20th century.

Radial engine

Radial engines are used primarily in aeroplanes and helicopters.

Measuring time

The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.

De Havilland DH-106 Comet 1 (1949)

The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.

Battle of Marathon (490 BC)

The marathon running event was instituted in commemoration of the run of a Greek soldier after the Battle of Marathon, fought between the Athenian and the...

The history of aviation

The animation offers a summary of the history of aviation from the Middle Ages.

Battle of Salamis (480 BC)

The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.

Auschwitz-Birkenau concentration camp

More than one million people died in the WWII Nazi death camp located in present-day Poland.

Levels of biological organisation

This animation presents levels of biological organisation from the level of the individual organism to the level of cells.

Adrenaline (advanced)

Adrenaline, also known as epinephrine, is a hormone produced in our body in stressful situations and plays an important role in the fight-or-flight response.

The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.

Jameh Mosque (Isfahan, 15th century)

Its architectural solutions and ornamentation rank this mosque among the masterpieces of Islamic art.

Cube (exercises)

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

Continental drift on a geological timescale

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

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Axit sunfurơ (H₂SO₃)

Là axit yếu, không màu, chỉ tồn tại trong dung dịch.

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