Megabase (MB): Unit of length for dna fragments equal to 1 million nucleotides and roughly equal to 1 cm.
Millibar (Mb): The standard unit of measurement for atmospheric pressure used by the National Weather Service. One millibar is equivalent to 100 newtons per square meter. Standard surface pressure is 1,013 . . . View Full Definition
Megabyte (MB): About a million bytes of space. Actually it's 2 raised to the 20th power or 1,048,576 bytes of space.
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Chromogenic Materials: Color photographic materials which form dyes during processing.