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The degree of polymerization, the average number of monomer units per polymer unit.

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Thermodynamics

The study of the energy transfers accompanying physical and chemical processes.

Bond Energy

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase).The amount of energy necessary to break one mole of bonds in a substance, dissociating the sustance in the gaseous state into atoms of its elements in the gaseous state.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

A brief history of dyeing fabrics

 Dyeing fabrics is giving the fibers a homogeneous color that has a certain degree of strength. The methods of dyeing are very diverse, depending on the properties of the dyes and the dyed fibers.

Evaporation Rate

The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

Buffer Solution

Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.

Octane Number

A number that indicates how smoothly a gasoline burns.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.