Flowability, also known as powder flow, is a property that defines an ability of a powdered material to flow, related to cohesion. Powder flowability depends on many traits:
the shape and size of the powder particles due to intermolecular force, porosity electrostatic activity hygroscopy bulk density angle of repose presence of glidants oxidation rate (of a metallic powder) humidity ISO 4490:2018 norm (and its precedent, ISO 4490:2014) standardizes a method for determining the flow rate of metallic powders. It uses a normalized/calibrated funnel, named Hall flowmeter.
See also Fluid mechanics Soil mechanics Cohesion (geology) angle of repose
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