Graphic area in the geometric representation of (1)s: S△=? Ah. The size of the plane figure occupied by objects is called their area. Area is the size of a plane figure.
(2)s stands for standard deviation in statistics, s? It means variance. Variance is a measure of dispersion when probability theory and statistical variance measure random variables or a set of data. Variance in probability theory is used to measure the deviation between random variables and their mathematical expectations (that is, the mean value).
(3) lowercase s is the symbol of seconds, and seconds are the unit of time. Time unit second is the basic unit of time in the international system of units, with the symbol S, sometimes marked with the English abbreviation sec.
Extended data:
The meaning of s in other disciplines:
(1) electrical unit
1. susceptance refers to the imaginary part of the circuit, which is represented by a complex number and defined by the following formula Y=G jB. Here y is admittance, g is the real part, called conductance, and b is susceptance. The unit of susceptance is Siemens (S).
2. In the international system of units, it is expressed by Siemens (conductance, susceptance and admittance, units of three reactances).
(2) Chemical units
1. means solubility in chemistry, and this word comes from the English name of solubility.
2. In chemistry, S stands for solid, which is sometimes marked in the reaction equation.
(3) Biological unit
1. stands for sedimentation coefficient, which is an index reflecting the downward settling speed of biological macromolecules in centrifugal field. The higher the value, the larger the molecule.
References:
Baidu encyclopedia -s