Those wavelengths come only from the top few micrometers of Mercury. (sciencenews.org)
Working at the National Ignition Facility, Smith and his colleagues aimed 176 lasers at a pellet of iron a few micrometers thick wrapped in a gold cylinder. (sciencenews.org)
In her computer simulations, she reproduces the bahavior of particles which are no bigger than a few micrometers — comparable to viruses or small bacteria. (sciencedaily.com)