To find the Grashof number from this point, the preceding equation must be non-dimensionalized. This means that every variable in the equation should have no dimension and should instead be a ratio characteristic to the geometry and setup of the problem. This is done by dividing each variable by corresponding constant quantities. Lengths are divided by a characteristic length, formula_35. Velocities are divided by appropriate reference velocities, formula_36, which, considering the Reynolds number, gives formula_37. Temperatures are divided by the appropriate temperature difference, formula_38. These dimensionless parameters look like the following: