Assertion: liquid hydrogen | /r/HasProperty | cryogenic
Facets:
Source sentences:
text: However, liquid hydrogen is cryogenic and boils at 20.268 K (–252.882 °C or –423.188 °F).
text: In addition, liquid hydrogen is a cryogen and presents dangers (such as frostbite) associated with very cold liquids.
text: Because liquid oxygen and liquid hydrogen are both cryogenic -- gases that can be liquefied only at extremely low temperatures -- they pose enormous technical challenges.