Plasma
Matter in the plasma state has variable volume and shape, but as well as neutral atoms, it contains a significant number of ions and electrons, both of which can move around freely.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Electron Sea (Plasma)."
http://en.wikipedia.org/wiki/File:Electron_Sea_(Plasma).jpg
Wikipedia
CC BY-SA.
.jpg){kind=link}