What does a picometer measure?

A picometer is an SI unit of length equal to 10⁻¹² meters, used for measuring extremely small distances such as atomic bond lengths.

What is the atomic unit of length?

The atomic unit of length is the Bohr radius, a fundamental length scale in atomic physics approximately equal to 5.29177210903×10⁻¹¹ meters.

When should I use this picometer to a.u. conversion?

Use this conversion to express atomic-scale distances in terms that simplify quantum mechanical calculations and analyses in atomic and molecular physics.

How to Convert from Picometer [pm] to A.u. of length [a.u., b]

Convert length measurements from picometers (pm) to atomic units of length (a.u., b) using this online converter, ideal for atomic-scale calculations and quantum chemistry applications.

Picometer [pm]

A.u. of length [a.u., b]

Please check your input. It must be a valid numeric value.

Picometer [pm] to A.u. of length [a.u., b] Conversion Table

Picometer [pm]	A.u. of length [a.u., b]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Picometer [pm] to A.u. of length [a.u., b] Conversion Table
Picometer [pm]	A.u. of length [a.u., b]

Explore More Length Units Converter

What Is This Tool?

This tool allows users to convert length values from picometers, a unit used for extremely small atomic distances, to atomic units of length based on the Bohr radius, which is essential in atomic and quantum physics.

How to Use This Tool?

Enter the length value in picometers (pm) you wish to convert
Select picometer as the source unit and a.u. of length as the target unit
Click convert to get the length expressed in atomic units of length (a.u., b)
Use the converted value for applications in atomic and molecular physics or quantum chemistry

Key Features

Accurate conversion from picometers to atomic units of length (a.u., b)
Useful for atomic-scale and quantum mechanical length measurements
Browser-based and easy to use without any installation
Supports scientific calculations involving electron orbitals and atomic geometries

Examples

10 pm equals 0.188972599 a.u. of length
50 pm equals 0.944862995 a.u. of length

Common Use Cases

Describing atomic and molecular bond lengths in chemistry and molecular physics
Reporting interatomic spacings in solid-state physics and materials science
Expressing electron orbital sizes and radial distributions in atomic physics
Simplifying numerical work in quantum-chemistry calculations like Hartree–Fock and DFT

Tips & Best Practices

Verify units before and after conversion to ensure accuracy in your calculations
Use this conversion tool specifically for atomic-scale length measurements, not macroscopic distances
Keep in mind the atomic unit of length is based on nonrelativistic quantum mechanical models
Apply the converted values to simplify theoretical models and analysis in quantum chemistry

Limitations

The conversion is valid only within atomic-scale, non-relativistic quantum contexts
Not intended for larger-scale or relativistic measurements
High numerical precision is needed due to very small values involved
Does not accommodate conversions outside the scope of atomic physics units

Frequently Asked Questions

What does a picometer measure?: A picometer is an SI unit of length equal to 10⁻¹² meters, used for measuring extremely small distances such as atomic bond lengths.
What is the atomic unit of length?: The atomic unit of length is the Bohr radius, a fundamental length scale in atomic physics approximately equal to 5.29177210903×10⁻¹¹ meters.
When should I use this picometer to a.u. conversion?: Use this conversion to express atomic-scale distances in terms that simplify quantum mechanical calculations and analyses in atomic and molecular physics.

Key Terminology

Picometer (pm): An SI unit of length equal to 10⁻¹² meters, used to measure extremely small distances at the atomic scale.
Atomic unit of length (a.u., b): The Bohr radius representing the typical distance between an electron and proton in hydrogen, used as a length unit in atomic physics.
Bohr radius: A fundamental atomic scale unit approximately equal to 5.29177210903×10⁻¹¹ meters, used as the basis for the atomic unit of length.

Quick Knowledge Check

What is one picometer equivalent to in atomic units of length?

0.188972599 a.u.

0.0188972599 a.u.

5.29177210903×10⁻¹¹ a.u.

For which scale is the picometer to atomic unit conversion most appropriate?

Macroscopic distances

Atomic-scale distances

Astronomical distances

What physical constant is the atomic unit of length based on?

Electron-proton separation in hydrogen

Speed of light

Gravitational constant

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