Controls for maintaining this condition, such as Gaster bumps, seek to prevent attachment-line contamination and T–S waves. Hoods or cabinets named for operating under this condition are used to prevent the contamination of sensitive samples. (-5[1])Tubular reactors operating under this condition allow for high control over the residence time of chemicals because a parabolic velocity profile will develop. When this condition and incompressibility hold, the pressure drop goes as one over the fourth power of pipe radius by Poiseuille’s (“pwah-ZUH-ee’s”) law. Smooth airfoils are designed to induce this condition, reducing drag from eddies and vortices. (10[1])Poured honey exemplifies a flow with this condition, which occurs at low Reynolds number. (10[1])For 10 points, name this sheet-like flow in which parallel layers do not mix, unlike turbulent flow. ■END■ (10[1])