Air FranceAir France (ɛːʁ fʁɑ̃s; formally Société Air France, S.A.), stylised as AIRFRANCE, is the flag carrier of France headquartered in Tremblay-en-France. It is a subsidiary of the Air France–KLM Group and a founding member of the SkyTeam global airline alliance. , Air France serves 29 destinations in France and operates worldwide scheduled passenger and cargo services to 201 destinations in 78 countries (93 including overseas departments and territories of France) and also carried 46,803,000 passengers in 2019.
History of the metreThe history of the metre starts with the Scientific Revolution that is considered to have begun with Nicolaus Copernicus's publication of De revolutionibus orbium coelestium in 1543. Increasingly accurate measurements were required, and scientists looked for measures that were universal and could be based on natural phenomena rather than royal decree or physical prototypes. Rather than the various complex systems of subdivision then in use, they also preferred a decimal system to ease their calculations.
Air transports of heads of state and governmentAir transports for heads of state and government are, in many countries, provided by the air force in specially equipped airliners or business jets. One such aircraft in particular has become part of popular culture: Air Force One, used by the President of the United States and operated by the United States Air Force. Other well known official aircraft include the Russian presidential aircraft, the British Royal Air Force VIP aircraft, the French Cotam 001, the Royal Canadian Air Force VIP aircraft, the German Konrad Adenauer, the Royal Australian Airforce VIP aircraft, the Japanese Air Force One, the South Korean Code One, Air India One, the Brazilian Air Force One, and the Israeli Wing of Zion.
MetrologyMetrology is the scientific study of measurement. It establishes a common understanding of units, crucial in linking human activities. Modern metrology has its roots in the French Revolution's political motivation to standardise units in France when a length standard taken from a natural source was proposed. This led to the creation of the decimal-based metric system in 1795, establishing a set of standards for other types of measurements.
