Abbreviation of Atomic Mass Unit, a convenient way for representing the masses of atoms The amu is defined by the mass of a neutral 12C atom, which weighs exactly 12 amu On this scale the proton has a mass of 1 0073 amu and the neutron a mass of 1 0087 amu 1 amu = 1 661 x 10-27 kg
atomic mass unit, the unit used to measure the masses of subatomic particles; a proton has a mass of 1 amu
A major river in Central Asia flowing across the border of Uzbekistan and Turkmenistan parallel to Syr Darya and into the Aral Sea. Known in classical times as Oxus
(Coğrafya) The Syr Darya (Persian: سيردريا; Tajik: Сирдарё; Kazakh: Сырдария ; Arabic: سيحون; Uzbek: Sirdaryo), also transliterated Syrdarya or Sirdaryo, is a river in Central Asia, sometimes known as the Jaxartes or Yaxartes from its Ancient Greek name Ἰαξάρτης. The Greek name is derived from Old Persian, Yakhsha Arta ("Great Pearly"), a reference to the color of the river's water. In medieval Islamic writings, the river is uniformly known as Sayhoun (سيحون) - after one of the four rivers of Paradise. (Amu Darya was likewise known as Jayhoun, the name of another one of the four)
ancient Oxus River River, Central Asia. It is one of the longest rivers in Central Asia, 1,578 mi (2,540 km) long measured from the remotest sources of the Panj River; its other headstream is the Vakhsh. It flows west-northwest to its mouth on the Aral Sea. It forms part of Afghanistan's borders with Tajikistan, Uzbekistan, and Turkmenistan and part of Uzbekistan's border with Turkmenistan