colloid – מילון אנגלי-אנגלי
colloid
adj.
sticky, resembling glue
n.
sticky substance composed of particles that do not dissolve in other substances
Colloid
A
colloid, in
chemistry, is a substance in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance. Sometimes the dispersed substance alone is called the colloid; the term
colloidal suspension refers unambiguously to the overall mixture (although a narrower
sense of the word
suspension is contradistinguished from colloids by larger particle size). Unlike a
solution, whose
solute and
solvent constitute only one
phase, a colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). To qualify as a colloid, the mixture must be one that does not
settle or would take a very long time to settle appreciably.
colloid
Noun
1. a mixture with properties between those of a solution and fine suspension
(hypernym) mixture
(hyponym) silver protein
(class) dispersed phase, dispersed particles
Colloid
(n.)
A substance (as albumin, gum, gelatin, etc.) which is of a gelatinous rather than a crystalline nature, and which diffuses itself through animal membranes or vegetable parchment more slowly than crystalloids do; -- opposed to crystalloid.
(n.)
A gelatinous substance found in colloid degeneration and colloid cancer.
(a.)
Resembling glue or jelly; characterized by a jellylike appearance; gelatinous; as, colloid tumors.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
colloid
Say it A colloid is a
heterogeneous mixture composed of tiny particles suspended in another material. The particles are larger than molecules but less than 1 µm in diameter. Particles this small do not settle out and pass right through filter paper. Milk is an example of a colloid. The particles can be solid, tiny droplets of liquid, or tiny bubbles of gas; the suspending medium can be a solid, liquid, or gas (although gas-gas colloids aren't possible).
