# mass

> The mass of the rigidbody.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public float mass { get; set; }
```

### Remarks

Different Rigidbodies with large differences in mass can make the physics simulation unstable.

Higher mass objects push lower mass objects more when colliding. Think of a big truck, hitting a small car.

A common mistake is to assume that heavy objects fall faster than light ones. This is not true as the speed is dependent on gravity and damping.

### Examples

```csharp
 // Expose mass to allow adjustment from
 // the inspector.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public float mass;
    public Rigidbody rb;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.mass = mass;
    }
}
```