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   What is an exact number?

   • An exact number is a value that is known with complete certainty. In other words, an exact number has zero uncertainty and an infinite number of significant figures. An exact number cannot be simplified or reduced. Examples of exact numbers included counted numbers, defined units, and defined unit conversions.

   What Is an Exact Number? Definition and Examples

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   Is a counted number an exact number?

   • While counted numbers are exact, any measured value contains inherent uncertainty. The uncertainty comes from the limit of the measuring device and the skill of the person performing the measurement. Here is the definition of an exact number and an explanation of why some numbers, such as measured values, are not considered exact.

   What Is an Exact Number? - ThoughtCo

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   What are examples of Exact numbers?

   • Examples of exact numbers are counted numbers of objects or certain unit conversions. For example, there are exactly 3 feet in 1 yard. There are exactly 12 eggs in a dozen. A class may contain exactly 25 students. Most exact numbers are integers, but it's possible for a value to have a decimal point.

   What Is an Exact Number? - ThoughtCo

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   How do you know if a number is exact?

   • However, if a quantity is exact, it has an infinite number of significant figures. This is because there is no last digit that was guessed, all digits were known with certainty (and all places further to the right of the number are know with certainty to be zero). So how do you tell if a number is measured or exact?

   Exact vs Measured Numbers – Math Review for Chemistry

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2. sciencenotes.org › what-is-an-exact-numberWhat Is an Exact Number? Definition and Examples

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   Sep 19, 2021 · An exact number is a value with zero uncertainty and an infinite number of significant figures. Learn how to identify exact numbers in chemistry, physics, and math with examples and references.

3. www.thoughtco.com › exact-number-chemistryWhat Is an Exact Number? - ThoughtCo

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   Updated on July 09, 2019. An exact number is a value that is known with complete certainty. Examples of exact numbers are counted numbers of objects or certain unit conversions. For example, there are exactly 3 feet in 1 yard. There are exactly 12 eggs in a dozen.

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     Numbers: Exact vs Measured Numbers

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     What are Exact Numbers in Significant Figures?

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5. chem.libretexts.org › Courses › Modesto_Junior1.4: Measurements and Exact Numbers - Chemistry LibreTexts

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   May 19, 2021 · Exact Numbers. Exact numbers have no uncertainty. You can think of them as having an infinite number of significant digit. This is not possible for any measurement, but it is possible in these cases: Counted items; Defined values; For example, if you pour a substance into four beakers, the number 4 is exact.

6. mlpp.pressbooks.pub › chapter › measured-vs-exactExact vs Measured Numbers – Math Review for Chemistry

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   Learn how to distinguish between exact and measured numbers in science, and how to use significant figures in unit conversions. Exact numbers have an infinite number of significant figures, while measured numbers have a finite number of significant figures.

7. study.com › academy › lessonExact Numbers in Chemistry | Definition, Properties & Examples

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   Sep 29, 2022 · Learn what an exact number is and how it differs from an inexact number in chemistry. See examples of exact numbers expressed in whole numbers and decimals, and understand their importance and properties.

8. openstax.org › books › chemistry-2e1.5 Measurement Uncertainty, Accuracy, and Precision - OpenStax

   openstax.org › books › chemistry-2e

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   Learning Objectives. By the end of this section, you will be able to: Define accuracy and precision. Distinguish exact and uncertain numbers. Correctly represent uncertainty in quantities using significant figures. Apply proper rounding rules to computed quantities.

9. chem.libretexts.org › Courses › Widener_University1.4: Measurement Uncertainty, Accuracy, and Precision

   chem.libretexts.org › Courses › Widener_University

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   May 23, 2022 · The result of such a counting measurement is an example of an exact number. If we count eggs in a carton, we know exactly how many eggs the carton contains. The numbers of defined quantities are also exact. By definition, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilogram.