Glossary

Gram.

Grams per cubic centimetre.

Grams per litre.

Pressure above atmospheric.

A measure of the force per area exerted by a fluid using atmospheric pressure as a zero reference.

The difference between two absolute pressures, one of which is usually atmospheric pressure.

Gallon.

Gallons per minute.

Gallons per second.

A state of matter in which substances exist in the form of non-aggregated molecules, and which, within acceptable limits of accuracy, satisfies the ideal gas laws: usually a highly superheated vapour.

A gaseous detection technique which involves the separation of mixtures by passing them through a column that will enable the components to be held up for varying periods of time before they are detected and recorded.

Gas re-circulating fans (GR fans) are used for controlling steam temperature, furnace heat absorption and slagging of heating surfaces. GR fans are located in a flue system that is re-circulating or sending gas back to the furnace for reheating. Gas from the boiler, economizer or air heater outlet is re-introduced to the furnace by the GR fans. The flue gas temperature that the fan is re-circulating back to the furnace is between 500 degrees and 700 degrees F, depending on where the flue gas is taken. In most instances, the flue gas is obtained from the economizer outlet flue. The operating temperatures of the GR fans will require thermal insulation for heat conservation, and may also require acoustical sound and noise protection.

Any machine that converts mechanical energy into electrical energy.

Gallons per hour (flow).

Gallons per minute.

A metric unit of weight. One ounce equals 28.4 grams.

A louvered covering for an opening through which air passes.

This is the profit your company makes before considering operating and administrative expenses. It is calculated by subtracting the Cost of Goods Sold from Sales. It can also be expressed as a percentage by dividing a company's gross profits by its sales.

The amount of freight must be paid, whether the goods are delivered or not, provided that the failure of the delivery is due to reasons which are not controlled by the conveyor.