The cp2k units list
# CP2K Available Units of Measurement

## Undefined

If the default unit of a keyword is explicitly undefined, all possible units of measurement can be used to define a proper value.

**internal_cp2k**

## Energy

Possible units of measurement for Energies. The [energy] entry acts like a dummy flag (assumes the unit of measurement of energy is in internal units), useful for dimensional analysis.

**hartree**
**wavenumber_e**
**joule**
**kcalmol**
**kjmol**
**Ry**
**eV**
**K_e**
**energy**

## Length

Possible units of measurement for Lengths. The [length] entry acts like a dummy flag (assumes the unit of measurement of length is in internal units), useful for dimensional analysis.

**bohr**
**m**
**pm**
**nm**
**angstrom**
**length**

## Temperature

Possible units of measurement for Temperature. The [temperature] entry acts like a dummy flag (assumes the unit of measurement of temperature is in internal units), useful for dimensional analysis.

**K**
**au_temp**
**temperature**

## Pressure

Possible units of measurement for Pressure. The [pressure] entry acts like a dummy flag (assumes the unit of measurement of pressure is in internal units), useful for dimensional analysis.

**bar**
**atm**
**kbar**
**Pa**
**MPa**
**GPa**
**au_p**
**pressure**

## Angle

Possible units of measurement for Angles. The [angle] entry acts like a dummy flag (assumes the unit of measurement of angle is in internal units), useful for dimensional analysis.

**rad**
**deg**
**angle**

## Time

Possible units of measurement for Time. The [time] entry acts like a dummy flag (assumes the unit of measurement of time is in internal units), useful for dimensional analysis.

**s**
**fs**
**ps**
**au_t**
**wavenumber_t**
**time**

## Mass

Possible units of measurement for Masses. The [mass] entry acts like a dummy flag (assumes the unit of measurement of mass is in internal units), useful for dimensional analysis.

**kg**
**amu**
**m_e**
**mass**

## Potential

Possible units of measurement for potentials. The [potential] entry acts like a dummy flag (assumes the unit of measurement of potential is in internal units), useful for dimensional analysis.

**volt**
**au_pot**
**potential**