A method is described which permits measurement of the exterior surface areas of objects down to about 0.1 sq. in. in area. In this method, the object is coated with an adhesive and a single layer of small metal particles. The change in weight gives a measure of the external area of the object.

Systematic variations in the density of the metal particle coating are discussed, and appropriate correction factors are given.

This method is intended for use in research that involves objects whose exterior surface areas have an effect on the process being investigated. Examples are the drying of agricultural grains and foodstuffs, the comminution of ores and chemicals, and the hydraulic and pneumatic transport of materials.

The precision of the method is adequate, the root-mean-square error being about 1%.