Assertion: alpha | /r/ObjectUse | used in physics
Facets:
value: as a symbol
type: PURPOSE
value: in the names of things
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: Alpha is often used in physics and chemistry as a symbol or in the names of things, for example alpha particles (which are two protons and two neutrons bound together into a particle the same as a helium nucleus).