# Charge Density

Charge density data is obtained directly from the CHGCAR files that are output by our static DFT calculations. For more detailed information about this data [see the VASP wiki](https://www.vasp.at/wiki/index.php/CHGCAR).

An isosurface visualization of the charge density can be found on the material details pages. To obtain the full set of volumetric data for a given material [the API should be used.](/downloading-data/using-the-api/examples.md#charge-density-for-silicon-mp-149)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.materialsproject.org/methodology/materials-methodology/charge-density.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
