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	m2/m3
grain size	...
...	...
104 m	10-3
103 m	10-2
102 m	10-1
101 m	100
1 m	101	1 m sphere, cube | ~ human (skin only)
10-1 m	102
10-2 m	103	~ human
10-3 m	104	~ lungs	sand
10-4 m	105	~ capilaries	fine sand
10-5 m	106	~ mayonnaise (oil droplets)	silt | suspension
10-6 m	107		colloid | suspension
10-7 m	108		colloid
10-8 m	109	~ sorbent / molecular sieve	colloid
10-9 m	1010	molecules	solution | colloid
10-10 m	1011	atoms	solution
10-11 m	1012
	...

Landmarks

1 m³ cube's area - 6 m² (10¹ × 0.6, exact (6 sides))

1 m³ sphere's area - 5 m² (10¹ × 0.5, +3%, ±<1%)

101 × 0.4836	±<1%	4pir2 for r = 0.6204 m so that 4/3 pi r3 = 1 m3
101 × 0.5	+3%, ±<1%
101	+×2, ±2%

Surface-area volume-density (m²/m³) for grains is about 6 × grain width^-1

So 1 m grains give 6 m2/m3, 10-1 m grains give 101 × 6 m2/m3, and 10-2 m give 102 × 6. 6× assumes grains are smooth cubes. Its 5× for smooth spheres. And any roughness would increase this by introducing additional (smaller) "grain" sizes. The 6 (or 5 or whatever) is dimentionless (m3/m3).

Doables:
 lawn example, charcoal/sorbent filtering example
 molecular slices.  oil on water.
 charcoal
 clay silt soil etc.  Films and wilting point.
 clarify grains.  droplets etc.  simple closed volume of m^-1 10.
 clean up landmarks
 link to sphere when that gets cleaned up
 I am unsure what to call this
           area volume-density
   surface-area volume-density
        surface volume-density

Notes:
sorbent 103 m2 / gram [SciAm 96oct p115]
  so say about 109 m2/m3.
lungs 10^2 m^2 over 10^-2 m^3 lung
skin  10^0 m^2 over 10^-1 m^3 human
capilaries 10^4 m^2 over 10^-1 m^3 human

"sorbent to sphere" (this concept bogus, left as a reminder)

Names&more names: <1 nm = solution; 1 nm to 1 um = colloid; >1 um = suspension
From nanophase's Glossary[link broken].
There has to be a better naming strategy...

History:
 2003-Feb-04  Flagged 3 broken links.
 1999.Mar.21  Repaired link to `About Nanomaterials'.
 1997.Aug.20 Oops.  Removed bogus "(not posible)" and extended scale
              for objects larger than 1 m.
 1997.Aug.12 Added mayo, sand, landmarks.
 ...