| Definition: | finely divided solid particles, 500 μm or less in nominal size, that can form explosive mixtures with air at standard atmospheric pressure and temperatures Note 1 to entry: This includes dust and grit as defined in ISO 4225:1994, Air quality – General aspects – Vocabulary. Note 2 to entry: The term "solid particles" is intended to address particles in the solid phase and not the gaseous or liquid phase, but does not preclude a hollow particle.
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