OCCLUSION n.
of gases (Chem. & Physics), the phenomenon of absorbing gases, as exhibited by platinum, palladium, iron, or charcoal; thus, palladium absorbs, or occludes, nearly a thousand times its own volume of hydrogen, and in this case a chemical compound seems to be formed.
PLATINUM n.
semble platinum. These consist of the light platinum group, viz., rhodium, ruthenium, and palladium, whose specific gravities are about 12; and the heavy platinum group, viz., osmium, iridium, and platinum, whose specific gravities are over 21. -- Platinum sponge (Chem.), metallic platinum in a gray, porous, spongy fo…
VIOLA n.
g the viola, but larger, and held between the knees. It is now rarely used. -- Viola da spalla Etym: [It., viol for the shoulder], an instrument formerly used, resembling the viola, and intermediate in size between the viola and the viola da gamba. -- Viola di amore Etym: [It., viol of love: cf. F. viole d'amour], a…