[Home](./index.md) > [server](./server.md) > [ParticleEmitter](./server.particleemitter.md) > [lifetimeVariance](./server.particleemitter.lifetimevariance.md) ## ParticleEmitter.lifetimeVariance property The lifetime variance of an emitted particle in seconds. **Signature:** ```typescript get lifetimeVariance(): number | undefined; ```