ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Ammonium chloride subliming from a mixture with salt (NaCl). Ammonium chloride (NH4Cl) vaporises readily when heated, but condenses on the cool glass at the top of the test tube. This leaves the salt at the bottom of the tube.
Model release not required. Property release not required.