Yeast

Properties
Section	Powders
Spawn temperature	22°C
Heat Conductivity	28%
Relative weight	80
Gravity	0.1
Acid dissolve rate	3%
Flammability	15
State	Powder
Transitions
High temperature	above 99.85°C
Source code

Yeast grows when warm (around 40°C+). It turns into DYST when exposed to Neutrons or heated a lot (about 120°C+). It turns to DUST at about 220°C. Note that DYST at any temperature turns YEST into DYST in a cascading effect.