International System of Units

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International System of Units

 

In·ter·na·tion·al Sys·tem of U·nits (SI),

, Système International d'Unités (in'tĕr-na'shŭn-ăl sis'tem yū'nits, sēs-tĕm' ahn-tĕr-nahs-ē'ōn-nahl' dūn'nē-tā'),
A system of measurements, based on the metric system, adopted at the 11th General Conference on Weights and Measures of the International Organization for Standardization (1960) to cover both the coherent units (basic, supplementary, and derived units) and the decimal multiples and submultiples of these units formed by use of prefixes proposed for general international scientific and technologic use. SI proposes seven basic units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), candela (cd), and mole (mol) for the basic quantities of length, mass, time, electric current, temperature, luminous intensity, and amount of substance, respectively; supplementary units proposed include the radian (rad) for plane angle and steradian (sr) for solid angle; derived units (for example, force, power, frequency) are stated in terms of the basic units (for example, velocity is in meters per second, m s-1). Multiples (prefixes) in descending order are: exa- (E, 1018), peta- (P, 1015), tera- (T, 1012), giga- (G, 109), mega- (M, 106), kilo- (k, 103), hecto- (h, 102), deca- (da, 101), deci- (d, 10-1), centi- (c, 10-2), milli- (m, 10-3), micro- (μ, 10-6), nano- (n, 10-9), pico- (p, 10-12), femto- (f, 10-15), atto- (a, 10-18). Proposed prefixes are zetta- (Z, 1021), yotta- (Y, 1024), zepto- (z, 10-21), and yocto- (y, 10-24).
[Fr. Système International d'Unités]

In·ter·na·tion·al Sys·tem of U·nits

(SI) (in'tĕr-nash'ŭn-ăl sis'tĕm yū'nits)
A system of measurements, based on the metric system, adopted at the 11th General Conference on Weights and Measures of the International Organization for Standardization (1960) to cover both the coherent units (basic, supplementary, and derived units) and the decimal multiples and submultiples of these units formed by use of prefixes proposed for general international scientific and technologic use. SI proposes seven basic units: meter (m), kilogram (kg), second (s), ampere (A), Kelvin (K), candela (cd), and mole (mol) for the basic quantities of length, mass, time, electric current, temperature, luminous intensity, and amount of substance; supplementary units proposed include the radian (rad) for plane angle and steradian (sr) for solid angle; derived units (e.g., force, power, frequency) are stated in terms of the basic units (e.g., velocity is in meters per second, m/sec-1). Multiples (prefixes) in descending order are: exa- (E, 1018), peta- (P, 1015), tera- (T, 1012), giga- (G, 109), mega- (M, 106), kilo- (k, 103), hecto- (h, 102), deca- (da, 101), deci- (d, 10-1), centi- (c, 10-2), milli- (m, 10-3), micro- (μ, 10-6), nano- (n, 10-9), pico- (p, 10-12), femto- (f, 10-15), and atto- (a, 10-18). The prefix zepto (z) has been proposed for 10-21.
[Fr. Système International d'Unités]

In·ter·na·tion·al Sys·tem of U·nits

(SI) (in'tĕr-nash'ŭn-ăl sis'tĕm yū'nits)
System of measurements, based on the metric, to cover both coherent units (basic, supplementary, and derived units) and the decimal multiples and submultiples of these units formed by use of prefixes proposed for general international scientific and technologic use. SI proposes seven basic units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), candela (cd), and mole (mol) for the basic quantities of length, mass, time, electric current, temperature, luminous intensity, and amount of substance, respectively. Multiples (prefixes) in descending order are: exa- (E, 1018), peta- (P, 1015), tera- (T, 1012), giga- (G, 109), mega- (M, 106), kilo- (k, 103), hecto- (h, 102), deca- (da, 101), deci- (d, 10-1), centi- (c, 10-2), milli- (m, 10-3), micro- (μ, 10-6), nano- (n, 10-9), pico- (p, 10-12), femto- (f, 10-15), atto- (a, 10-18). Proposed prefixes are zetta- (Z, 1021), yotta- (Y, 1024), zepto- (z, 10-21), and yocto- (y, 10-24).
[Fr. Système International d'Unités]
References in periodicals archive ?
He said Malaysia has about five billion cubic millimeters of underground water and this untapped resource is useful in times of water shortages or crisis.
At just nine cubic millimeters, it's the size of a Vitamin C tablet, but it's solar powered, it has an internal battery and radio, and it is equipped with its own processor called the Phoenix (Figure 1).
The active part of the harvester that enables the energy conversion occupies just 27 cubic millimeters. The packaged system can sit comfortably on a penny.
The machine can cut to within 2 microns accuracy and remove 5 cubic millimeters per minute from metals and non-metals.
This means, if you have 100 cubic millimeters of an elastomer, it can change shape, but cannot be reduced in volume, unlike a metal which can lose volume.
Objective: We propose to engineer and validate a novel random access three-dimensional two-photon (2P) laser scanning microscope which can simultaneously image three different brain regions in the three spatial dimensions (3x3D system), where each scanned volume can exceed cubic millimeters. Our 3x3D system, which allows the simultaneous recording of neuronal activity in multiple, functionally connected distant brain volumes, is essential for understanding distributed brain computations.
They have produced an energy-harvesting system that combines a solar cell, battery, and associated electronics that occupies less than 10 cubic millimeters.
A colony founded by one of these intruders typically grabs only a few cubic millimeters of internal leaf space, favoring locations near the plant's internal plumbing.
For example, depending on units used, the value of A at time t might be expressed in terms of moles of oxygen reacted per cubic millimeters of rubber.
The volume of cholesterol dropped from 60.4 cubic millimeters to 37.4 cubic millimeters, and the percentage of plaque volume consisting of cholesterol dropped from 14.2 percent to 7.4 percent.