Assertion: phosphine | /r/HasProperty | gaseous form of the element
Facets:
value: above −88°c
type: LOCATION
Source sentences:
text: Perhaps because of its strong association with elemental phosphorus, phosphine was once regarded as a gaseous form of the element, but Lavoisier (1789) recognised it as a combination of phosphorus with hydrogen and described it as phosphure d'hydrogène (phosphide of hydrogen).
text: Phosphine is widely used as a fumigant  as it is gaseous above −88°C with a density of 1.17 times that of air, which allows it to disperse readily during fumigation.
text: Perhaps because of its strong association with elemental phosphorus, phosphine was once regarded as a gaseous form of the element, but Lavoisier (1789) recognised it as a combination of phosphorus with hydrogen and described it as phosphure d'hydrogène (phosphide of hydrogen).[NB 2]