# Interface for 3D momentum

3D momentum vectors of all backends have the following attributes, properties, and methods.

This includes momentum synonyms. For purely geometric vectors, see [Interface for 3D vectors](vector3d.md).

```{eval-rst}
.. autoclass:: vector._methods.MomentumProtocolSpatial
    :members:
    :inherited-members:
    :member-order: bysource
```