text: 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.