gapci -gac- gismu

x1 is gaseous/fumes/a gas/vapor of material/composition including x2, under conditions x3.

x3 includes temperature and pressure. See also pambe, vacri, litki, sligu, danmo, bumru, cidro, flecu.

In notes:

bumru
x1 is foggy/misty/covered by a fog/mist/vapor of liquid x2.
cidro
x1 is a quantity of/contains/is made of hydrogen (H); [metaphor: light, flammable].
danmo
x1 is made of/contains/is a quantity of smoke/smog/air pollution from source x2.
flecu
x1 is a current/flow/river of/in x2 flowing in direction to/towards x3 from direction/source x4.
litki
x1 is liquid/fluid, of composition/material including x2, under conditions x3.
navni
x1 is a quantity of/contains/is made of noble gas of type x2 [helium/neon/argon/krypton/xenon/radon].
pambe
x1 is a pump/injector [tool/apparatus] pumping/inserting fluid x2 to x3 from x4 by means x5.
sligu
x1 is solid, of composition/material including x2, under conditions x3.
vacri
x1 is a quantity of air/normally-gaseous atmosphere of planet x2, of composition including x3.
bumgapci
x1 is fog/mist of liquid/composition x2 covering x3.
fletu'u
x1=t1 is a pipe/tube/hose carrying fluid x2=f2=t3 towards x3=f3 from x4=f4 (direction/source)
gacydunja
x1=d1=g2 desublimates from the gaseous state at temperature x2=d2=g3 with pressure x3=d3.
jaurgacmatra
m1 is a steam engine driving m2.
jaurgapci
x1=g1=d1 is steam/water vapor under conditions x2=g3.
kolgapci
x1 is a quantity of coal gas
maisru
x1=s1=m1 is the material environment/surrounding material (i.e. gaseous/liquid atmosphere, vacuum, etc.) enclosing x2=s2 in direction(s)/dimensions(s)/plane x3=s3=m3, of type/composition including x4=m2.
tabrelkijno
x1 is a quantity of carbon dioxide (CO₂)
tabypavykijno
x1 is a quantity of carbon monoxide (CO)
tolfragapci
x1=t1=g1 is inert gas of material/composition including x2=g2, under conditions x3=g3.
zmalitki
l1 is a superfluid (state of matter) of composition/material l2 under conditions l3
rakle
x1 is an atomic element in group x2 [usually, vertical column; denotes electron configuration and, thereby, chemical similarity with vertical neighbors] and period x3 [usually, horizontal row; denotes similarity in size with horizontal neighbors, as well as having the same number and type of electron shells as them] and belonging to other 'class'/'category'/'type'/having other properties x4 according to scheme/organization pattern/standard/periodic table x5.
etxani
x1 is some ethane
metxani
x1 is some methane/CH4/marsh gas/natural gas
orvalu
x1 condenses/liquefies from vapour phase at temperature x2, pressure x3; x1 is dew/condensate
plasimi
x1 is a plasma (state of matter) of matter x2
ratniklesi
x1 is an atomic element in group x2 [usually, vertical column; denotes electron configuration and, thereby, chemical similarity with vertical neighbors] and period x3 [usually, horizontal row; denotes similarity in size with horizontal neighbors, as well as having the same number and type of electron shells as them] and belonging to other 'class'/'category'/'type'/having other properties x4 according to scheme/organization pattern/standard/periodic table x5.