Conversions can be done either with the "->" conversion operator or with the equivalent "convert" function. The function has three parameters: a quantity, a unit to convert from and a unit to convert to. Likewise the conversion operator uses three values: the quantity and unit to convert from are placed on the left side of the operator while the unit to convert to goes to the right side.
The basic unit of viscosity is the poiseuille. All units of viscosity are expressed in terms of this base unit and so measurements can be converted from any one of the following units to any other.
DL TITLE="Viscosity">10 poiseuille -> poise = 100
convert(10; poiseuille; poise) = 100
10 poiseuille -> reyn = 1.4503774
convert(10; poiseuille; reyn) = 1.4503774
10 poise -> poiseuille = 1
convert(10; poise; poiseuille) = 1
10 reyn -> poiseuille = 68.947573
convert(10; reyn; poiseuille) = 68.947573
10 reyn -> poise = 689.47573
convert(10; reyn; poise) = 689.47573
10 poise -> reyn = 0.1450377
convert(10; poise; reyn) = 0.1450377