### substance | mixture | alloy:

Sterling silver
* is alloy
  - an alloy of silver and copper
  - the standard for beautiful high-quality silver jewelry
  - too reactive a metal for body piercings
* is used for jewellery, silverware, etc. where appearance is paramount
  - jewelry and silverware, where appearance is important
  - widely for jewelry and elegant flatware

Titanium alloy
* are less dense and stronger compare to other metals
  - metals that contain a mixture of titanium and other chemical elements
  - technologically important
* are used in clocks
  - eyeglasses
* can exhibit sensitivity to both oxygen and hydrogen environments.
* fall into three classes, depending on the structures present.
* have excellent resistance to hot chloride containing aqueous environments.
* is used in compressors for aircraft engines.

Tungsten alloy
* competes with depleted uranium for use in kinetic energy penetrators.
* dense metal that is more durable than nickel plated or brass.

### substance | mixture:

Colloid
* Some colloids have unusual properties that are useful for treating specific cases.
* also figure in the transport of inorganic and organic pollutants in streams and rivers.
* are a classic example of chemically controlled nanostructures
  - also an important feature of the natural environment
  - complex fluids that contain small particles of a solid or liquid
  - extremely small substances suspended in a liquid, solid or gaseous medium
  - fine sub-micron sized particles usually kept in suspension by Brownian motion
  - nontoxic
  - particles so small that they often appear to be dissolved in the water
  - solids, liquids or gases that hold a substance in suspension
  - submicron sized particles that pass through filters
* are suspensions of finely divided solids or liquids floating in a gaseous or liquid medium
  - or liquids in gaseous or liquid fields
  - tiny particles of one substance dispersed in an other phase
  - systems of fine particles suspended in fluid
* are the minutest particles of albumen
  - third category of minerals
* are very small in size and therefore are easily absorbed by the cells of the body
  - size, and therefore easily absorbed by the cells of the body
  - particles that suspend in liquids such as water
* can only act as seed crystals if they have a high electric potential.
* have applications in such areas as pigments, magnetic recording media and ceramics.
* is mixture
* play an important part in organic functions, such as digestion and excretion
  - role in determining soil base status and fertility
* readily pass back and forth from the sol to the gel states.

### substance | mixture | colloid:

Emulsion
* Some emulsion consists of water.
* are a type of solution in which surface tension plays a role
  - dispersions of very small drops of bitumen in water
  - heat processed fish by-products
  - liquid-liquid colloids, tiny liquid droplets suspended in another liquid
  - milky in appearance and solubilised oils, for example - are clear to the eye
  - stable mixtures of two immiscible liquids
  - ubiquitous throughout the food industry
  - usually thick in texture and satiny in appearance
* can be in liquid form or in capillary film form.
* contain millions of microscopic oil droplets suspended permanently in water.
* gelatin made of millions of light-sensitive silver halide crystals.
* is coating
  - perceived in different ways by different industries
* light sensitive material which consists of a suspension of silver halides in gelatin.
* photosensitive solution that reacts to UV light.
* special photosensitive coating similar to photographic film.
+ Surface tension, Effects in everyday life, Surfactants: Basic physics ideas‏‎ :: Fluid mechanics
  * Emulsions are a type of solution in which surface tension plays a role. Tiny fragments of oil suspended in pure water will spontaneously assemble themselves into much larger masses.