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physical object > natural object > collection of particles

collection of particles
subject			fact

collection of particles	is a kind of natural object
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of collection of particles :

• phase of matter (57 kinds, 390 facts) - 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.