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In physics, the Heisenberg uncertainty principle advises us that the momentum and position of an electron cannot be known both precisely and simultaneously.
Chemists describe the estimated degree of error in a measurement as the uncertainty of the measurement, and they are careful to report all measured values using only significant figures, numbers that describe the value without exaggerating the degree to which it is known to be accurate.
16 Μαρ 2000 · Nature - Molecular hydrogen is a deceptively complex system, especially at high pressures. New theoretical studies need to take into account the quantum character of the protons and electrons ...
5 Δεκ 2022 · Error & Uncertainty. An error is the difference between a value or quantity obtained in an experiment and an accepted or literature value for an experiment. There are two types of errors in experiments, random errors and systematic errors.
Random error has an equal chance of being positive or negative. It is always present and cannot be corrected. Absolute uncertainty expresses the margin of uncertainty associated with a measurement. Relative uncertainty compares the size of the absolute uncertainty with the size of its associated measurement.
A crucial ingredient in our analysis of the origin of this randomness is the notion of the effective wave function of a subsystem, a notion of interest in its own right and of relevance to any discussion of quantum theory.
Absolute uncertainty: the true numerical value (often with units), indicating the range in which the true value lies. Percentage uncertainty: this expresses the absolute uncertainty as a proportion of the measurement.
