While his predecessors Thales and Anaximander proposed that the arche, the underlying material of the world, were water and the ambiguous substance apeiron, respectively, Anaximenes asserted that air was this primary substance of which all other things are made.

While the choice of air may seem arbitrary, he based his conclusion on naturally observable phenomena in the process of rarefaction and condensation .< ref > Guthrie, W. K. C.

While the sun is similarly described as being aflame, it is not composed of rarefied air like the stars but rather of earth like the moon ; its burning comes not from its composition but rather from its rapid motion .< ref > Kirk, G. S., J. E.

While the term — literally meaning " sailing the air "— originally referred solely to the science of operating the aircraft, it has since been expanded to include technology, business and other aspects related to aircraft.

While the Reno Air Races keep this tradition alive, most air shows today primarily feature a series of aerial demos of short duration.

If the air mass is colder than the ground below it, it is labeled k. If the air mass is warmer than the ground below it, it is labeled w. While air mass identification was originally used in weather forecasting during the 1950s, climatologists began to establish synoptic climatologies based on this idea in 1973.

* 1960 – 1960 New York air disaster: While approaching New York's Idlewild Airport, a United Airlines Douglas DC-8 collides with a TWA Lockheed Super Constellation in a blinding snowstorm over Staten Island, killing 134.

While in the FA Cup final against Manchester United, United were looking for their first trophy since the Munich air disaster of five years earlier which had claimed the lives of eight of the Busby Babes whom Banks had faced as an adolescent.

While laying the foundation stone of the National Defence Academy ( India ) in 1949, he stated: " We, who for generations had talked about and attempted in everything a peaceful way and practiced non-violence, should now be, in a sense, glorifying our army, navy and air force.

* While the theory correctly reasons that deflection implies that there must be a force on the wing, it does not explain why the air is deflected.

While many of the World Bank mission's recommendations were much argued both locally and internationally this proposal was widely accepted as it was clear that both political and economic advancement depended on greatly improved land, sea and air transport.

While one is working the land, the other is carried upside-down in the air.

While Gute Zeiten, schlechte Zeiten, Unter uns, Verbotene Liebe and Alles was zählt are currently the only daily soaps on the air, the telenovelas Sturm der Liebe and Rote Rosen are considered soaps by the press as well, thanks to the changing protagonists every season.

While pronking, the Springbok repeatedly leaps into the air in a particular stiff-legged posture, with its back bowed and the white fan lifted.

" While the details of the attack are disputed — Michigan claimed it fired no shots and had only discharged a few musket rounds in the air as the Ohio group retreated — the battle further infuriated both Ohioans and Michiganders and brought the two sides to the brink of all-out war.

While they suggest covering just a channel access method ( namely a variant of CDMA ), they are actually the common names for the whole air interface standards.

While the same rule generally applies in all jurisdictions, some countries such as Cuba and Russia have taken advantage of air rights on a national level to earn money.

While in the air, Skalbania worked on the deal.

While in the air the rider attempts to do tricks.

* February 27 – While trying to circumnavigate the world in a hot air balloon, Colin Prescot and Andy Elson set a new endurance record after being aloft for 233 hours and 55 minutes.

While Earth is considered " north "; Fire is " south "; air is " east "; Water is " west ", while Akasha is " center ".

While his wife convalesced in the cool ocean air, President Garfield brought his cabinet to Elberon for consultation and ran the government by telegraph.

While a throwing stick can also be shaped overall like a returning boomerang, it is designed to travel as straight as possible so that it can be aimed and thrown with great force to bring down game.

While initially welcomed by the Catholics as a neutral force compared to the RUC, relations between the nationalists and the Army soon deteriorated.

While the 1990 constitution remains in force, it has been amended four times since its adoption — in 1997, 2000, 2001 and 2010.

While this prohibition remained in force in general throughout the middle and early modern ages, this is no longer the case and Western women are often seen wearing trousers, ties, and men's hats.

While objects naturally follow a straight path ( due to inertia ), this centripetal acceleration describes the circular motion path caused by a centripetal force.

While the force acting on each surface molecule is ~, the force acting on the whole element is ~~.

While the RSA patent expired in 2000, there are patents in force covering certain aspects of ECC technology, though some argue that the Federal elliptic curve digital signature standard ( ECDSA ; NIST FIPS 186-3 ) and certain practical ECC-based key exchange schemes ( including ECDH ) can be implemented without infringing them.

While Ash is dealing with this force, the professor's daughter, Annie, and her research partner, Ed Getley, return from the dig with more pages of the Necronomicon in tow, only to find the destroyed bridge.

While Menelik's victory was in a large part due to sheer force of numbers, Menelik's careful preparations had made them well-armed numbers.

While supporters of trigger locks argue that they will save children from dying in gun accidents, critics point to demonstrations that some models can be removed by children with very little force and common household tools.

While their main force had constructed siege works and was close to taking the cities of Thessalonica and Cassandreia, it retreated to the Balkan interior at the news that the emperor was advancing.

While other ancient powers such as the Carthaginians maintained a patchwork of force types, and the legions retained such phalanx-style holdovers like the triarri, Marius implemented one consistent standardised approach for all the infantry.

While Sunni Islam was the state religion, there was not widespread pressure to convert ; indeed, Jahangir specifically warned his nobles that they " should not force Islam on anyone .” In the first century of Islamic expansion this attitude was taken partially because of concerns that an absence of non-Muslims would deprive the state of a valuable source of revenue.

" While he allowed for the possibility of peaceful transition in some countries with strong democratic institutional structures ( such as Britain, the US and the Netherlands ), he suggested that in other countries with strong centralised state-oriented traditions, like France and Germany, the " lever of our revolution must be force.

While it was by no means the only creative force behind Arthurian romance, many of its elements were borrowed and developed ( e. g., Merlin and the final fate of Arthur ), and it provided the historical framework into which the romancers ' tales of magical and wonderful adventures were inserted.

While salmon are usually hunted by an individual or a small group of individuals, herring are often caught using carousel feeding ; the killer whales force the herring into a tight ball by releasing bursts of bubbles or flashing their white undersides.

While the sale of the territory by Spain back to France in 1800 went largely unnoticed, fear of an eventual French invasion spread nationwide when, in 1801, Napoleon sent a military force to secure New Orleans.

While Louis was at Worms gathering a new force, Lothair marched north.

While in other nations the customs officials were responsible for most stops, in Mali, gendarmerie ( National paramilitary police ) and the Police force were found creating the majority of bribe extorting roadblocks.

While officers of the reorganized force were Protestant, membership of the other ranks was now made available to members of all denominations.

While the treaty is not in force, Russia has not tested a nuclear weapon since 1990 and the United States has not since 1992.

While pressure may be measured in any unit of force divided by any unit of area, the SI unit of pressure ( the newton per square metre ) is called the pascal ( Pa ) after the seventeenth-century philosopher and scientist Blaise Pascal.