---
title: sizeMultiplierAtEndOfLifespanPower
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/particleemittercomponent/particleemitter/sizemultiplieratendoflifespanpower
---

# sizeMultiplierAtEndOfLifespanPower

How quickly or slowly particle size changes over its lifetime — a value of 1 is linear, values below 1 transition quicker, values above 1 transition slower.

## Declaration

```swift
var sizeMultiplierAtEndOfLifespanPower: Float
```