colloid

/'kɔlɔid/

Thân thiện

A student prepares a colloid in a beaker during a chemistry experiment.

Definition

1. Noun:
   • A mixture with properties between those of a solution and a fine suspension: A colloid is a type of mixture where one substance of microscopically dispersed insoluble particles is suspended throughout another substance. The particles are larger than those in a solution but smaller than those in a suspension, giving the mixture unique properties.

Usage

• General Use: The term is used primarily in scientific contexts, especially chemistry and physics, to describe a specific state of matter.
• Key Characteristic: A colloid appears homogeneous to the naked eye but is heterogeneous at the microscopic level. It does not settle out under the influence of gravity.

Examples

• Noun:
  • Milk is a common example of a colloid.
  • Fog is a colloid where tiny water droplets are dispersed in air.
  • The gelatin dessert formed a stable colloid.

Advanced Usage

• "Colloidal dispersion": Another term for a colloid, emphasizing the dispersed state of the particles.
  • The paint is a colloidal dispersion of pigment particles in a liquid.
• "Colloidal state": Refers to the condition or phase of being a colloid.
  • The substance exists in a colloidal state, which gives it its unique optical properties.

Variants and Related Words

• Colloidal (adjective): Of or relating to a colloid.
  • The mixture exhibited colloidal behavior.
• Colloidally (adverb): In a colloidal manner.
  • The particles are dispersed colloidally.

Synonyms

• Dispersion: A system in which particles are dispersed in a continuous phase.
• Colloidal system: A more technical synonym for colloid.

Related Phrases and Concepts

• Tyndall effect: The scattering of light by particles in a colloid, which makes a beam of light visible.
  • The Tyndall effect is a key way to identify a colloid.
• Brownian motion: The random motion of particles suspended in a fluid (a liquid or a gas) resulting from their collision with the fast-moving molecules in the fluid. This motion helps prevent colloidal particles from settling.
  • Brownian motion keeps the particles in a colloid from sedimenting.

Học thuật

Noun

1. a mixture with properties between those of a solution and fine suspension