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DOES A PYCNOMETER MEASURE THE TRUE OR APPARENT PARTICLE DENSITY OF AGRICULTURAL MATERIALS?

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  076186.(doi:10.13031/2013.23513)
Authors:   Oladiran O Fasina, (or initial) (or initial)
Keywords:   Density, porosity, grains, legumes,

Particle density is one of the most important physical properties of agricultural materials because of their importance in process calculations and in characterizing of these materials. Depending on the measurement system used, particle density can be either true or apparent. When particle density measurements are reported in agricultural, food and bioprocess engineering literature however, the particle density type is often not specified and it is usually assumed that the true particle density is the same as the apparent particle density. This paper will show that this is not the case for nine grains and legumes (corn, rice, blackeye beans and pinto beans). In general, it was found that the apparent particle density can be up to 26% lower than the true particle density and is affected by moisture content. This information is important in the design and selection of processes and equipment for handling, storing, and transporting agricultural materials.

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