def

gas

Substance with neither definite volume nor shape

meta

def gas
doc See above
is fluid
lib phScience
wikipedia https://wikipedia.org/wiki/Gas

supertypes

marker

Marker labels a dict with typing information

    phenomenon

Aspect of scientific interest with measurable quantities

        substance

Matter in one the three states solid, liquid, or gas

            fluid

Liquid or gas

subtypes

air

The mixture of gases which surrounds the earth

    weather

Associated with atmospheric air or phenomenon

naturalGas

Fossil fuel energy source consisting largely of methane and other hydrocarbons

steam

Water in its gas form