50.6 MB (3.2 MB compressed)
4789 x 3695 pixels
40.6 x 31.2 cm ⏐ 16.0 x 12.3 in (300dpi)
SCIENCE SOURCE / SCIENCE PHOTO LIBRARY SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Mole units of a selection of elements. Clockwise starting with the balloon: helium, sulfur, iron, aluminium. The mole is a unit often used in chemistry. A mole represents the amount of an element that equals the number of atoms, photons, electrons, etc in 12 grams of carbon-12.
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