CH1012
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14
SURFACE AREA
Surface Area
Available surface area determines reactivity and adsorption properties for a particle. 
The ratio: S.A. / Volume is high for colloids.
Length of side Number of Total Surface
of cube cubes area of cubes
1 cm 1 6 cm2
1mm 103   (in 1 cm3) 60 cm2
Colloids
1 mm 1012 6 m2
10 nm                  1018                  600 m2