School, undergraduate & advanced physics
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An uncertainty stated in the same unit as the measured quantity, usually written as value ± uncertainty.
For sums and differences, absolute uncertainties are commonly added for a worst-case estimate.
A growing reference from school fundamentals through undergraduate and selected advanced physics. No finite collection contains every specialised equation or theory; use topic and level filters, and always check assumptions.
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Equations use SI quantities unless stated otherwise. Numerical values retain the units, precision and conditions of their source. Diagrams are explanatory models; their captions identify simplifications.