# Difference between baryonic, inertial and gravitational mass? (and relation to dark matter)

Inertial mass: determined from Newton's f = ma

Gravitational mass: determined via Newton's law of gravity

Baryonic mass: sum of mass of all baryons.

1. Which ones will include mass of dark matter?
2. Since dark matter does not interact with matter, therefore it should not have "normal" inertial mass.
3. Does dark matter interact with itself and have its own "dark matter" inertial mass?
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I believe the current hypothesis is that all matter, dark or otherwise, has "mass" which is affected in the same way by gravity. Dark matter does not interact with normal matter via electromagnetism or other forces, but gravity closes this gap. – Florin Andrei Nov 8 '11 at 21:44
@FlorinAndrei: Isn't that pretty much what "matter" means? – Keith Thompson Nov 9 '11 at 8:09