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 Sci Advisor HW Helper Thanks PF Gold P: 5,056 You can't really leave out the physical properties, because they will be critical to arriving at the dimensionless groups. You will not be able to form the proper dimensionless groups without including the physical properties, since their dimensions will cancel in the formulation of the key dimensionless groups. For example, in your system, some of the groups involved will the the Prantdl number, the Reynolds number, and the Nussult number. All of these involve the physical properties.