---
title: particleAlphaSpeed
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skemitternode/particlealphaspeed
---

# particleAlphaSpeed

The rate at which the alpha value of a particle changes per second.

## Declaration

```swift
var particleAlphaSpeed: CGFloat { get set }
```

## Discussion

Discussion The default value is 0.0.

## See Also

### Blending Particles with the Framebuffer

- [particleBlendMode](spritekit/skemitternode/particleblendmode.md)
- [particleAlphaSequence](spritekit/skemitternode/particlealphasequence.md)
- [particleAlpha](spritekit/skemitternode/particlealpha.md)
- [particleAlphaRange](spritekit/skemitternode/particlealpharange.md)