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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.


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.


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


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


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.


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.


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


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


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


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


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. .


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

Kiln Dust

Dust produced during cement or lime processing.