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The gram (originally gramme; [1] SI unit symbol g) is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram.. Originally defined in 1795 as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre [1 cm 3], and at the temperature of melting ice", [2] the defining temperature (≈0 °C) was later changed to 4 °C ...
10 −1 g dg decigram 10 1 g dag decagram 10 −2 g cg: centigram: 10 2 g hg hectogram 10 −3 g mg: milligram: 10 3 g kg: kilogram: 10 −6 g μg: microgram (mcg) 10 6 g Mg megagram 10 −9 g ng: nanogram: 10 9 g Gg gigagram 10 −12 g pg picogram 10 12 g Tg teragram 10 −15 g fg femtogram 10 15 g Pg petagram 10 −18 g ag attogram 10 18 g Eg ...
The base units are defined in terms of the defining constants. For example, the kilogram is defined by taking the Planck constant h to be 6.626 070 15 × 10 −34 J⋅s, giving the expression in terms of the defining constants [1]: 131 1 kg = (299 792 458) 2 / (6.626 070 15 × 10 −34)(9 192 631 770) h Δν Cs / c 2 .
The table lists various objects and units by the order of magnitude of their volume.. Chain structures in meteorite fragment ALH84001 Electron micrograph of icosahedral adenovirus A scanning electron microscope image of normal circulating human blood showing red blood cells, several knobbly white blood cells including lymphocytes, a monocyte, a neutrophil and many small disc-shaped platelets ...
For example, 50 g of zinc will react with oxygen to produce 62.24 g of zinc oxide, implying that the zinc has reacted with 12.24 g of oxygen (from the Law of conservation of mass): the equivalent weight of zinc is the mass which will react with eight grams of oxygen, hence 50 g × 8 g/12.24 g = 32.7 g.
Grams per Square Metre (paper thickness; properly g/m 2) Ground Station Module Groupe spécial mobile (French, "Special Mobile Group"; official expansion is now Global System for Mobile Communications)
In the original study in the UK, [1] one FTU weighed 0.49 g in men and 0.43 g in women. The area covered by one FTU was 312 cm 2 in men and 257 cm 2 in women. [2] Very similar results were found in a Mexico study. [5] The weight of an FTU has been recalculated in Japan, relating to the use of 5 g tubes of ointment with a much smaller nozzle ...
The most recent prefixes adopted were ronna-, quetta-, ronto-, and quecto-in 2022, after a proposal from British metrologist Richard J. C. Brown (since before 2022, Q/q and R/r were the only Latin letters available for abbreviations, all other Latin letters are either already used for other prefixes (a, c, d, E, f, G, h, k, M, m, n, P, p, T, Y ...