Calculation the Uncertainty
Definition :
Absolute Uncertainty of an Algebraic Sum: The absolute uncertainty of an algebraic sum of undefined numbers is equal to the arithmetic sum of the absolute uncertainties of these numbers. Consider an algebraic sum given: y = nu + pv qw + k, where n, p, and q are constant and positive coefficients; k is a constant whithout uncertainty; and are the respective absolute uncertainties of u, v, and w. The absolute uncertainty of y ( y) is given by the sum of the absolute uncertainties of the individual terms in the sum.
The relative uncertainty of a product or quotient: It should be distinguished in two cases: First situation: Independent quantities. Statement of the theorem: The relative uncertainty of a product or quotient, when quantities are independent of each other, is equal to the arithmetic sum of each term of relative uncertainties.