volatility.
feather, dust, mote, down, thistle, down, flue, cobweb, gossamer,
straw, cork, bubble, balloon; float, buoy; ether, air.
leaven, ferment, barm†, yeast.
lighter-than-air balloon, helium balloon, hydrogen balloon, hot
air balloon.
convection, thermal draft, thermal.
V. be light &c adj.; float, rise, swim, be buoyed up.
render light &c adj.; lighten, leaven.
Adj. light, subtile, airy; imponderous†, imponderable; astatic†,
weightless, ethereal, sublimated; gossamery; suberose†, suberous†;
uncompressed, volatile; buoyant, floating &c v.; portable.
light as a feather, light as a thistle, light as air; lighter than
air; rise like a balloon, float like a balloon
SECTION II.
INORGANIC MATTER