pound/gallon (UK) Unit Converter

Definition of pound/gallon (UK) unit

Pound per gallon (UK) is a mass-concentration unit expressing one avoirdupois pound of a substance dissolved or dispersed in one Imperial gallon of solution. It equals approximately 99.84 grams per litre and is written lb/gal (UK).

History of pound/gallon (UK) unit

The pound per gallon (UK) combines two traditional British measures: the avoirdupois pound, standardized internationally at 453.59237 grams, and the Imperial gallon, established by the British Weights and Measures Act of 1824 as 277.419 cubic inches, or about 4.54609 litres. The unit emerged in engineering, brewing, chemical processing, and commerce, where mass-to-volume descriptions were customary. Although the United Kingdom gradually adopted metric units, Imperial measures remain familiar in some industries and legacy specifications. Today, the unit is chiefly encountered in historical documents, technical conversions, and specialized British or Commonwealth contexts.

Applications of pound/gallon (UK) unit

It is used to state the concentration of dissolved solids, chemicals, or suspended materials when specifications originate in Imperial units. Examples include older water-treatment records, industrial formulations, mining reports, and some brewing or agricultural documents. Modern users often convert it to grams per litre, kilograms per cubic metre, or pounds per US gallon to avoid ambiguity.

Complete list of pound/gallon (UK) unit conversion