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It is shown that the variance of a random physical quantity F can be expressed and directly calculated with the help of a microscopic parameter which under certain conditions may be called the invariable intrinsic «micro-quantity of chaos» (MQC). MQC is a self-sufficient concept that character- ises a physical system or a stochastic process. The following statement is proposed: if a random physical quantity F is additive and its fluctuations are statistically independent, then its variance can be expressed as the product of the mean value and the corresponding value of the MQC = q F, i.e., = q F. . Physical situations are considered in the frame of which this statement has been sub- stantiated. The MQC concept is demonstrated for fluctuations in the ideal gas. Expressions of MQC are proposed for fluctuations of black body radiation, electrical and photocurrents. Arguments for useful- ness of the MQC concept are presented.

Microscopic parameters of a stochastic system and variance of physical quantity (ideal gas, electric current, thermal radiation of a black body)