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Effective density and mass The effective density of an aerosol particle relates its mobility diameter and mass, properties which govern the particles trajectory (through diffusion and impaction), and quantity of non-gaseous chemicals delivered during inhalation

Some are represented by different generations of production in different countries, and the difference is noticeable

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The previous congresses had been comprised mostly of "Black middle-class British and American intellectuals," but the Manchester congress "was dominated by delegates from Africa and Africans working or studying in Britain." The 5th Pan-African Congress was largely organized by Amy Ashwood Garvey and Amy Jacques Garvey and featured "major forces of decolonization," including Kwame Nkrumah and Jomo Kenyatta