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| physical object > natural object > collection of particles > phase of matter > ylem | 
| ylem comparison table | ||
| Subject | has definition | is a kind of | 
|---|---|---|
| phase of matter | When used in reference to matter, describes its possible states: solid phase, liquid phase, gas phase. More generally, refers to the possible descriptions of a physical system as features on which it depends (temperature, string coupling constant values, form of spacetime, etc.) are varied. | collection of particles | 
| ylem | Primordial state of matter - neutrons and their decay products (protons and electrons) - before the Big Bang. The term was taken from Aristotle and used for the α-β-γ theory. | phase of matter | 
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