Reference library7 entries

Tag: exact numbers

Practical explanations, worked examples, and reference notes for reporting numbers correctly.

Counted Numbers vs Measured Numbers: Precision and Significant Figures

Counted numbers are exact and have infinite significant figures, while measured numbers carry uncertainty and are limited by the instrument's precision. This guide explains…

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Significant Figures

Significant Figures of Zero Itself: Rules, Conventions, and Pitfalls

Zero is the most ambiguous digit in significant figures. Learn the rules for leading, trailing, and captive zeros, plus conventions and standards.

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Significant Figures

Do Constants Like π and c Affect Significant Figures?

Constants such as π, e, and c are exact or have defined values, so they do not limit the number of significant figures in…

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SI Prefixes Table with Significant Figure Notes

SI prefixes are exact multipliers that do not affect the number of significant figures. Learn the rules, conventions, and common pitfalls when using prefixes…

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Exact Numbers Have Infinite Significant Figures — Here’s What That Means

Exact numbers, such as counted quantities and defined conversion factors, possess an infinite number of significant figures. This article explains the rule, provides worked…

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How Unit Conversion Factors Affect Significant Figures

Learn how unit conversion factors influence the number of significant figures in your results. Understand exact vs. inexact conversions, rounding rules, and standards.

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Significant Figures

Significant Figures in Stoichiometry Problems: Precision and Rounding Reference

A comprehensive guide to applying significant figures in stoichiometric calculations, covering rules, standards, common pitfalls, and worked examples.

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