My friend suggested cloud and hail cloud. Cloud will rain when heated (More than 400° C. ) and hail cloud will rail snow when cooled (Less than -400° C). Well if you agree give the tanks and credits to my friend(you can say thanks to him from me ^_^).

PowderToyRulez
In a few mods.

i know it is the periodic table but hydrogen the most abundant element in the entire universe isnt in the game as well as it could turn to water when introduced to oxygen

Wilq
yew101 already made that plastic thing

triclops200
How about firework. It could be a powder and when set on fire it could realese: neutrons,glow,some lava andsome plasma. It makesw a really preety effect.

fletchy2009
fireworks are in alpha 43.0

How about acid? Sure it burns through anything except block and stuff. Acid- antimatter (liquid)