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# lifetime

Defines a multiplier applied to the cell-defined lifetime range when particles are created. Animatable.

```
var lifetime: Float { get set }
```

## Discussion

Default value is `1.0`.

By setting an emitter’s [`lifetime`](/documentation/QuartzCore/CAEmitterLayer/lifetime) to `0`, you effectively stop particle emission: all new particles created have their [`lifetime`](/documentation/QuartzCore/CAEmitterCell/lifetime) set to `0` and are never rendered.

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