In spirals the ISM is a complex soufflé of hot (million Kelvin) and cool (3 to 100 Kelvin), gas, where the cooler regions have higher density so that the pressure is roughly constant.
Higher density drives are built to read, write and even format lower density media without problems, provided the correct media is used for the density selected.
The next generation of optical storage media that uses a blue-violet laser, allowing for a higher density of data on a disc that is the same diameter as CD/DVD. Single-layer Blu-ray disks have capacity of 25GB and dual-layer can hold up to 50GB.
South Africa offers a higher density shark population off Dyer Island and excellent above-water viewing, as well as cage dives.
Dispersion Of the following wavelengths, which one has its speed reduced the most when it enters a medium of higher density? 1. Red 2. Yellow 3. Green 4.
 See also: Photography, Density, Light, Photograph, Blue
  
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