38.3 MB (38.0 MB compressed)
3392 x 3948 pixels
28.7 x 33.5 cm ⏐ 11.3 x 13.2 in (300dpi)
DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of common table salt, showing the roughly cubic grains with rounded edges (presumably rounded during production as an aid to pouring). Table salt contains over 99% sodium chloride, which in its pure state has a near perfect cubic crystal structure. The remaining 1% consists of sodium sulphate and magnesium chloride, which contribute to easy pouring by acting as dessicants (reducing effects of moisture). An average person needs about 3 grammes of salt per day to make up for losses via sweat, urine and faeces. Magnification: x13 at 35mm, x26 at 6x7cm size. Original is bw prit h100/240. COLOURED BLUE.
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