In general, the discriminant is an algebraic expression that gives. information about the roots of a polynomial. In the case of a quadratic equation the discriminant is the part of. the quadratic equation that is under the radical sign.
How to Select Dampers and Louvers. Dampers and louvers are used to control the flow of air in a process system or enclosed area. Dampers are usually motorized or manually-adjustable for flow control. Louvers are often fixed for a constant flow rate.
Velvet is woven, velour is knitted. Velvet can be cotton, silk, rayon, poly, and I think even wool. Velour is a knit fabric with the cut pile, stretchy. Velour is a knit fabric with stretch while velvet is a woven backed fabric.