Assertion: heavy water's hydrogen atom | /r/HasProperty | close
Facets:
value: in mass
type: OTHER
value: very
type: DEGREE
value: to a neutron
type: OTHER
Source sentences:
text: Light water makes an excellent moderator: the light hydrogen atoms are very close in mass to a neutron and can absorb a lot of energy in a single collision (like a collision of two billiard balls).