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A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI), and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern SI definition is " [The second] is ...
Orders of magnitude (mass) An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe. Typically, an object having greater mass will also ...
The mass of the Earth is about 6 Rg (ronnagrams). The mass of Jupiter is about 2 Qg (quettagrams). Examples of powers of units with metric prefixes. 1 km 2 means one square kilometre, or the area of a square of 1000 m by 1000 m. In other words, an area of 1 000 000 square metres and not 1000 square metres.
Dymaxion world map with continental landmasses (I,II,III,IV) and largest islands (1–30) roughly to scale. This list includes all islands in the world larger than 2,500 km 2 (970 sq mi) and most of the islands over 1,000 km 2 (390 sq mi), sorted in descending order by area.
An order of magnitude of time is usually a decimal prefix or decimal order-of-magnitude quantity together with a base unit of time, like a microsecond or a million years. In some cases, the order of magnitude may be implied (usually 1), like a "second" or "year". In other cases, the quantity name implies the base unit, like "century".
Carboniferous rainforest collapse. 305 Ma. Possiblities include a series of rapid changes in climate, or volcanism of the Skagerrak-Centered Large Igneous Province [34] Serpukhovian extinction. ~ 325 Ma. Onset of the Late Paleozoic icehouse. Devonian. Hangenberg event.
The gravet is a unit of mass equal to one gram (1 g). The grave is a unit of mass equal to one kilogram (1 kg). The bar is a unit of mass equal to one megagram (1 Mg). Linear mass density. The tex (tex) is a unit of linear mass density equal to one gram per kilometre (1 g/km). The number metric (Nm) is equal to 1000 metres per kilogram (1 km/kg).
Mass in M E, the unit of mass equal to that of Earth ( 5.97 × 10 24 kg). Λ is the capacity to clear the neighbourhood (greater than 1 for planets) by Stern & Levison (2002): [28] Λ = k m 2 a − + 3 / 2 , where k = 0.0043 for m in units of yottagrams (10 18 metric tons ) and a in astronomical units ( AU ), where a is the body's semi-major axis.