Conduction

The transfer of heat by molecular collision. This process is more efficient in metals and other thermal conductors and poorer when combustion products build up on heat exchange surfaces.

Control

A device designed to regulate the fuel, air, water, steam, or electrical supply to the controlled equipment. It may be automatic, semi-automatic or manual.

Contamination

The addition of some unwanted substance to a product or intended mixture of products.

Damping

Removal of kinetic energy in an oscillating medium by converting it to heat using frictional or viscous forces.

Decibel

A division of a uniform scale based upon 10 times the logarithm to the base ten of the ratio of sound field intensities being compared

Diffuse sound field

A sound field in which the energy density is the same everywhere and sound waves are likely to be travelling in any direction with equal probability.

Focusing

Concentration of acoustic energy within a limited location in a room as the result of reflections from concave surfaces.

Free field

A region in which no significant reflection of sound happens

Fundamental frequency

The frequency with which a periodic function reproduces itself.

Furnace

An enclosed chamber where high temperature reactions or combustion take place.

Gasification

The process of converting solid or liquid products into a gaseous fuel through heating in the absence or reduced presence of oxygen.

Gypsum

Calcium sulfate dihysrate, CaS04.2H2O, used in wallboard manufacture, and fertilizers.

Harmonic

A sinusoidal component in a complex periodic wave of frequency, which is an integral multiple of the fundamental frequency of the wave.

Hygroscopic

A substance that absorbs moisture from the air.

Induced draft fan

A fan which pulls a gas or air stream usually used for high temperature gasses. .

Intensity

The rate of sound energy transmitted in a specified direction through a unit area

Kiln Dust

Dust produced during cement or lime processing.