27.0 MB (27.0 MB compressed)
3828 x 2466 pixels
32.5 x 20.8 cm ⏐ 12.8 x 8.2 in (300dpi)
JOHN HENDRY / SCIENCE PHOTO LIBRARY JOHN HENDRY / SCIENCE PHOTO LIBRARY
Polarised light micrograph of crystals of ammonium sulphate, mag. X 25. A white, crystalline solid, ammonium sulphate is produced in large quantities in industrial processes, often as a product of neutralisation operations on sulphuric acid. It is also produced in coke-oven operations, where the ammonia gas given off is neutralised with sulphuric acid, giving ammonium sulphate. Its major use is as a fertiliser, adding sulphur and nitrogen to the soil: it is also used in dry cell batteries, as a soldering liquid, & as a flame retardant for fabrics.
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