A. Scientific Dictionary for Hydraulic and Pneumatic Systems Search through Lessons 17 through 20 to find the word, phrase, or law* which best fits each definition, description, or statement. When you have finished, the list will be in alphabetical order.

--a structure with curved surfaces designed to increase the ratio of lift to drag, often used in aircraft wings

--the two-dimensional extent of a flat surface; e.g., R2 for a circle

--the pressure exerted on objects at the surface of the Earth by weight of the layers of the atmosphere above them

--a device for measuring atmospheric pressure, either mercury or aneroid

-- * "The pressure exerted by a moving fluid is inversely proportional to the speed of the fluid."

--the ability of a substance to change its volume as a result of a change in pressure

--a three-dimensional shape with parallel sides and circular ends; e.g., a soup can

--the ratio of the mass of an object to its volume the force of friction opposing motion through a fluid (a.k.a. air resistance when the fluid is air)

--a circular movement of water, counter to the main flow (a.k.a. vortex or whirlpool)

-- any substance that can flow and take the shape of its container

--a compressible fluid, one of the three ordinary states of matter

--a system which used a liquid as its fluid, e.g., the human circulatory system

--the pressure exerted by a column of liquid

--the type of flow where the layers of a moving fluid flow smoothly past one another

--a force which acts upwards, often on an airfoil

--an incompressible fluid, one of the three ordinary states of matter

--* "The pressure applied to an enclosed liquid is transmitted equally to all parts of the liquid and to the walls of its container."

--a solid disk that fits snugly into a hollow cylinder and applies pressure to the fluid therein, or is subject to pressure from that fluid

--a system which used a gas as its fluid, e.g., the human respiratory system

--the ratio of the force applied to a surface to its area

--the design and operation of automated machinery

--a non-fluid substance having a fixed shape and a fixed volume, one of the three ordinary states of matter

--the height of a column of fluid exerting a specific pressure at the bottom of the column

-- contouring a structure to minimize drag

--the type of flow where a moving fluid flows in a chaotic and disorganized manner, producing eddies

-- the resistance of a fluid to flow

-- the three-dimensional extent of a space or object; e.g., R2h for a cylinder

--the rate with respect to time of flow of a fluid