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In the metric system, the mass per unit area of all types of paper and paperboard is expressed in terms of grams per square metre (g/m 2).This quantity is commonly called grammage in both English and French, [2] though printers in most English-speaking countries still refer to the "weight" of paper.
3 nm – the average half-pitch of a memory cell manufactured circa 2022; 3.4 nm – length of a DNA turn (10 bp) 3.8 nm – size of an albumin molecule; 5 nm – size of the gate length of a 16 nm processor; 5 nm – the average half-pitch of a memory cell manufactured circa 2019–2020; 6 nm – length of a phospholipid bilayer
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.
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm), or nanometer (American spelling), is a unit of length in the International System of Units (SI), equal to one billionth (short scale) or one thousand million (long scale) of a meter (0.000000001 m) and to 1000 picometres.
In ultrafiltration, the molecular weight cut-off or MWCO of a membrane refers to the lowest molecular weight of the solute (in daltons) for which 90% of the solute is retained by (prevented from passing through) the membrane, [1] or the molecular weight of the molecule (e.g. globular protein) that is 90% retained by the membrane.
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
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Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (in commercial contexts often called percentage by weight, abbreviated wt.% or % w/w; see mass versus weight). It is one way of expressing the composition of a mixture in a dimensionless size ; mole fraction (percentage by moles , mol%) and volume fraction ...