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Earth's gravity measured by NASA GRACE mission, showing deviations from the theoretical gravity of an idealized, smooth Earth, the so-called Earth ellipsoid. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker (Animated version). [1]
Although the symbol ɡ is sometimes used for standard gravity, ɡ (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see Earth's gravity). The symbol ɡ should not be confused with G, the gravitational constant, or g, the symbol for gram.
The measured value of the constant is known with some certainty to four significant digits. In SI units, its value is approximately 6.6743 × 10 −11 m 3 kg −1 s −2. [1] The modern notation of Newton's law involving G was introduced in the 1890s by C. V. Boys.
It equals (3.986 004 418 ± 0.000 000 008) × 10 14 m 3 ⋅s −2. [4] The value of this constant became important with the beginning of spaceflight in the 1950s, and great effort was expended to determine it as accurately as possible during the 1960s.
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 ...
A troy ounce equals 1.097 standard ounces, or about 10 percent more, and it’s the standard measure for the weight of gold. ... This bar weighs a stunning 27.4 pounds and is worth $959,000 at the ...
10 −22: 170 yN Force measured in a 2010 experiment by perturbing 60 beryllium-9 ions [4] [5] 10 −18 attonewton (aN) 10 −17: 30 aN Smallest force of gravity measured [6] [7] 10 −15 femtonewton (fN) 10 −14 ~10 fN Brownian motion force on an E. coli bacterium averaged over 1 second [8] ~10 fN Weight of an E. coli bacterium [9] [10] 10 ...
Though typically not measured by pounds, seeing as 12 troy ounces equals a troy pound, and taking the current value of an ounce of gold as of Oct. 26, 2023, into account, a 1-pound gold bar would ...