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The curie (symbol Ci) is a non-SI unit of radioactivity originally defined in 1910. According to a notice in Nature at the time, it was to be named in honour of Pierre Curie , [ 1 ] but was considered at least by some to be in honour of Marie Curie as well, [ 2 ] and is in later literature considered to be named for both.
[1] [2] It is usually given in units of becquerel per kilogram (Bq/kg), but another commonly used unit of specific activity is the curie per gram (Ci/g). In the context of radioactivity , activity or total activity (symbol A ) is a physical quantity defined as the number of radioactive transformations per second that occur in a particular ...
The cardiac index (CI) is a hemodynamic measure that represents the cardiac output (CO) of an individual divided by their body surface area (BSA), expressed in liters per minute per square meter (L/min/m²). This parameter provides a more accurate assessment of heart function relative to the size of the individual, as opposed to absolute ...
The becquerel succeeded the curie (Ci), [12] an older, non-SI unit of radioactivity based on the activity of 1 gram of radium-226. The curie is defined as 3.7 × 10 10 s −1, or 37 GBq. [4] [13] Conversion factors: 1 Ci = 3.7 × 10 10 Bq = 37 GBq; 1 μCi = 37 000 Bq = 37 kBq; 1 Bq = 2.7 × 10 −11 Ci = 2.7 × 10 −5 μCi; 1 MBq = 0.027 mCi
2 148 and 2/3 of a year: A superstitious unit of time used in astrology, each of them representing a star sign. terasecond: 10 12 s: About 31,709 years. megaannum: 10 6 yr: Also called "megayear". 1000 millennia (plural of millennium), or 1 million years (in geology, abbreviated as Ma). petasecond: 10 15 s: About 31 709 791 years. galactic year ...
The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. metre: m length, , , etc. The distance travelled by light in vacuum in 1 / 299 792 458 second. kilogram [n 1]
x is the argument of the complex number (angle between line to point and x-axis in polar form). The notation is less commonly used in mathematics than Euler's formula, e ix, which offers an even shorter notation for cos x + i sin x, but cis(x) is widely used as a name for this function in software libraries.
While not an SI-unit, the litre may be used with SI units. It is equivalent to ( 10 cm ) 3 = ( 1 dm ) 3 = 10 −3 m 3 . While the International System of Units ( SI ) is used throughout the world in all fields, many non-SI units continue to be used in the scientific, technical, and commercial literature.