# Definition:Avogadro's Constant

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## Definition

**Avogadro's constant** is defined as the number of particles in a mole, expressed in a form where its unit of measurement is the reciprocal mole.

Hence its value is defined as:

- $6 \cdotp 02214 076 \times 10^{23} \, \mathrm {mol^{-1} }$

### Symbol

- $N_{\mathrm A}$

The symbol often used for **Avogadro's constant** is $N_{\mathrm A}$.

Its $\LaTeX$ code is `N_{\mathrm A`

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## Also known as

**Avogadro's constant** can also be seen referred to as **the Avogadro constant**.

## Also see

## Source of Name

This entry was named for Lorenzo Romano Amedeo Carlo Avogadro.

## Sources

- 1964: Milton Abramowitz and Irene A. Stegun:
*Handbook of Mathematical Functions*... (previous) ... (next): $2$. Physical Constants and Conversion Factors: Table $2.3$ Adjusted Values of Constants

*which gives the mantissa as $6 \cdotp 022 \, 169$ with an uncertainty of $\pm 40$ corresponding to the $2$ least significant figures*