# density

> The density, usually in kg/m^2, defaults to 1. This is not part of the surface material because this is for the interior of the shape, which may have other considerations, such as being hollow.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/6000.6/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public float density { readonly get; set; }
```