grain/cubic foot [gr/ft^3] Unit Converter

Definition of grain/cubic foot [gr/ft^3] unit

Grain per cubic foot is a density unit expressing one grain of mass distributed through one cubic foot of volume. It equals approximately 0.002288 kilograms per cubic meter and is commonly written as gr/ft³.

History of grain/cubic foot [gr/ft^3] unit

The grain originated as a traditional unit based on the nominal mass of a single cereal seed, although its standardized meaning later became 1/7000 pound, or about 64.7989 milligrams. The cubic foot developed within English units as a practical measure of space and was standardized through trade and engineering practice. Combining grain with cubic foot produced a convenient density expression for very light airborne or deposited materials. It appeared in older technical references, especially those involving dust, powders, and atmospheric measurements. It survives in historical data and conversion tables.

Applications of grain/cubic foot [gr/ft^3] unit

Today, grain per cubic foot is mainly encountered in legacy engineering documents, air-quality literature, and specialized density-conversion software. It can describe extremely low bulk densities of suspended dust, aerosols, or particulate deposits, although modern reports generally use kilograms per cubic meter. Converting values is important when comparing historical measurements with contemporary SI-based specifications.

Complete list of grain/cubic foot [gr/ft^3] unit conversion