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The gal (symbol: Gal), sometimes called galileo after Galileo Galilei, is a unit of acceleration typically used in precision gravimetry. [2] [3] [4] The gal is defined as 1 centimeter per second squared (1 cm/s 2). The milligal (mGal) and microgal (μGal) are respectively one thousandth and one millionth of a gal.
Other units include the cgs gal (sometimes known as a galileo, in either case with symbol Gal), which equals 1 centimetre per second squared, and the g (g n), equal to 9.80665 m/s 2. The value of the g n is defined as approximately equal to the acceleration due to gravity at the Earth's surface , although the actual acceleration varies slightly ...
On Earth the effect on gravity of elevation is 0.3086 mGal m −1 decrease when going up, minus the gravity of the Bouguer plate, giving the Bouguer gradient of 0.1967 mGal m −1. More generally, for a mass distribution with the density depending on one Cartesian coordinate z only, gravity for any z is 2π G times the difference in mass per ...
MgAl has also been investigated for use as a reactant to produce metal hydrides in hydrogen storage technology. Like many intermetallics, MgAl compounds often have unusual stoichiometries with large and complex unit cells. -Mg 2 Al 3 is a complex metallic alloy which crystallizes in cubic unit cell with 1168 atoms per cell.
The standard acceleration of gravity or standard acceleration of free fall, often called simply standard gravity and denoted by ɡ 0 or ɡ n, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth.
beer gal ≡ 282 cu in = 4.621 152 048 × 10 −3 m 3: gallon (imperial) gal (imp) ≡ 4.546 09 L: ≡ 4.546 09 × 10 −3 m 3: gallon (US dry) gal (US) ≡ 1 ⁄ 8 bu (US lvl) = 4.404 883 770 86 × 10 −3 m 3: gallon (US fluid; Wine) gal (US) ≡ 231 cu in ≡ 3.785 411 784 × 10 −3 m 3: gill (imperial); Noggin: gi (imp); nog ≡ 5 fl oz ...
The unit of gravity gradient is the eotvos (abbreviated as E), which is equivalent to 10 −9 s −2 (or 10 −4 mGal/m). A person walking past at a distance of 2 metres would provide a gravity gradient signal approximately one E. Mountains can give signals of several hundred Eotvos.
Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]