Geophysical granular flows occur at the surface of the Earth and other planets with reduced atmospheric pressure. In this paper, we investigate the run-out of dam-break flows of particle-air mixtures with fine (d = 75µm) or coarse (d = 150µm) grains in a flume with different bottom roughness (δ) and vacuum degrees (P * ). Our results reveal an increase of the flow run-out as d/δ decreases for fine d = 75µm-particles, and run-out decreases with the dimensionless ambient pressure (P * ) for a given d/δ. In contrast, the run-out
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