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. 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 (-5[1])power of pipe radius by Poiseuille’s (“pwah-ZUH-ee’s”) law. Smooth airfoils are designed to induce this condition, (10[1])reducing (10[1])drag from eddies and vortices. Poured honey (10[1])exemplifies a flow with this condition, which occurs at low Reynolds number. For 10 points, name this sheet-like (10[1])flow in which parallel layers do not mix, unlike turbulent flow. ■END■ (10[2])