I stumbled across this this evening, something I thought would be quite handy but unfortunately turned into some TSS (Time Spent Searching)…
In the Unity documentation for the ParticleSystem (5.4 but also 5.5b at the time of writing) an example tutorial is given for creating a small explosion. Unfortunately there are a couple of errors within this documentation.
The first being the reference to importing an asset package via;
Assets > Import Package > Particles
…which is actually;
Assets > Import Package > ParticleSystems
…this is fairly minor and easily spotted.
The second is a reference to the Fire Add material.
This material is no longer available within version 5 of Unity. There is however a ParticleFirecloud which is reasonably similar.
For anyone looking for the original Fire Add material, it is available within Unity version 4.
_Unity 4 Install Directory \ Editor \ Standard Packages \ Particles_
It’s a nice little tutorial for creating your first explosions 
Hope this helps someone else save a little time.