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physical object > natural object > particle > molecule > PAH

PAH
subject			fact

PAH	has definition Polycyclic Aromatic Hydrocarbon
	is a kind of molecule
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material