EM has various meanings in the NASA category. Discover the full forms, definitions, and usage contexts of EM in NASA.
Relating to a magnetic field created by an electric current.
NASAAny release of harmful materials into the environment. OR The giving off of environmental pollutants from various sources (WHO, 1979). OR the release of light from a chromogenic or fluorescent molecule, when an electron falls from an excited state to a lower energy state of the molecule.
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