### digital watch:

Polyurethane
* are either oil modified or moisture-cured
  - less expensive but are less durable
  - one of the most versatile group of plastics, used in a wide range of applications
  - the more popular surface sealers
  - very hygroscopic materials
* bonding gives a fabric mysterious color and soft, skin-like surface.
* coating offers waterproof protection.
* combine the performance of rubber materials with the processing ease of plastics.
* contain an amide-ester linkage and can be formed from a diisocyanate and a diol.
* contains bubbles of carbon dioxide which contribute to the cushioning effect.
* cure by reacting with moisture from air or materials
  - from the ambient moisture in the air.
  * Its name is often shortened to 'PU' or 'PUR'. Polyurethane is made of organic units, which are joined by urethane. Polyurethane polymers are formed through step-growth polymerization
* digital watch.
* eliminates shock marks as well as draw marks and reduces thinouts.
* finish with non-toxic color.
* foam that is blown into wall cavities.
* goes on thinner, and is therefore lighter.
* is also a good choice for the manufacture of bending stiffeners
  - less likely to cause an allergic reaction than latex
  - available with different levels of stiffness, hardness or densities
  - basically 'industrial strength' rubber
  - developed and used for stretch cloth
  - highly flammable and results in heavy smoke when burned
  - less susceptible than latex to deterioration during storage
* is made during the reaction of an isocyanate and one or more polyols
  - more expensive than latex, and more of it is used
  - stronger and found less prone to breakage than male condom
  - suggested to brighten colors
* is the basis of a novel type of elastomeric fiber known generically as spandex
  - material of choice for rollers
  - most common finish, and polys are either water based or oil based
* is the most popular filling used today
  - finish for flooring installed unfinished
  - unaffected by petroleum-based solvents and atmospheric contaminants
  - used for producing high detailed molds with unique shapes
* is very high in solids, and builds excellent without any type of sealer
  - thin, so both partners retain maximum sensitivity
* lasts for years and can be removed and used on another tree, at a later time.
* retains more heat than latex which increases the sensation of feeling during sex.
* rubber polymer coating.
* strong, thin material that conducts heat.
* tends to be more expensive as well
  - yellow over time
* type of plastic that is stronger than latex resulting in very thin condoms.
* works by maintaining firm control over the suspension unit it adjoins.

Dihedral group
* All dihedral groups contain a reflection.
* are all realizable in the plane.
* arise frequently in art and nature.

Dimensionality
* affects the material properties.
* determines how the input regions are interpreted.
* is set when the axes are set
  - the number of axes which are considered during execution
* refers to the longevity of the exchange or community being engendered.

### dimensionality:

Linearity
* addresses the degree of spatial evenness among the tone intervals.
* has to do with the one on one increase or decrease of one variable related to another.
* is dimensionality
  - primarily an issue for computer monitors that use CRTs
  - related to the ratio of the signal input to the signal output
  - the simplest and most frequently used concept in applications of mathematics
* means basically that effects are proportional to causes.