#fluid dynamics

• Aquaplaning — A dangerous physical and hydrodynamic phenomenon occurring when a vehicle or aircraft rolls over a water-covered surface, consisting of a total loss of tire adhesion due to the formation of a liquid film between the wheel and the road. This structural loss of direct contact negates braking and steering efficiency, leading to a loss of vehicle control.
• Aquatic — Pertaining to water, relating to water; living, developing, or practiced in water or on its surface. This term describes a structural variety of organisms, ecosystems, plants, or sporting activities whose anatomical, chemical, or operational characteristics are fully or partially adapted to fresh, brackish, or marine liquid environments.
• Adducted element — The product brought or collected through a channel, or, as an adjective, the description of an anatomical movement or structure that has been brought toward the median axis of the body. In structural anatomy, it represents a component or position resulting from the adduction process, performed by adductor muscles that draw a limb (arm or leg) toward the body's midline. In old hydrotechnics, it partially referred to a channel or conduit conveying fluid (similar to adduction).
• Water conveyance main — A formal variant or secondary terminology for the noun 'aducție' (adduction), denoting the complete system of structures, aqueducts, main channels, or large-scale pipelines designed for the capture and conveyance of fluids (especially potable or raw water) from a collection source directly to distribution nodes or treatment plants. In older medical or academic treatises, it was also occasionally used to describe the biological inward movement of limbs.
• Advection — The horizontal movement of an air mass or fluid, accompanied by the transport of its physical properties (such as temperature, moisture, salinity, or density); the physical process of large-scale bulk transport from one point to another within a fluid medium. In meteorology, advection is a key factor in weather dynamics, strictly distinguished from convection (vertical movement) and causing sharp temperature shifts.
• Advective — Relating to advection; caused, induced, or driven by the process of advection (the horizontal transport of an atmospheric or fluid property, such as mass, heat, or moisture). In synoptic meteorology, the term describes complex phenomena triggered by large-scale horizontal air mass movements, such as advective fog or advective frost, both originating from the sudden intrusion of an air front with contrasting thermal traits over a region.
• Aeraulics — A branch of applied physics and installation engineering that deals with the study of air flow, distribution, and treatment in ducts, enclosed spaces, or ventilation systems; the technique of designing structural air renewal and conditioning networks based on the principles of gaseous fluid dynamics.
• Aeriform — Having the form, properties, or appearance of air; a physical state of matter characterized by the lack of a definite shape and a fixed volume, showing a natural tendency for indefinite expansion. In modern scientific terminology, the term is used as a refined synonym for the gaseous state, describing substances whose molecules have high kinetic energy and minimal cohesion.
• Airlift — A technical installation, pump, or device based on the principle of pneumatic transport, used to lift a liquid or a mixture of water and sediments through a vertical pipe by injecting compressed air at the base. This system is widely used in aquaristics for water filtration, in petroleum engineering, and in dredging operations due to the absence of moving mechanical parts.
• Aerodyne — Any aircraft heavier than air, whose support and lift in the Earth's atmosphere are provided exclusively by the dynamic forces exerted by air on its lifting surfaces (fixed wings or moving rotors) during travel. The classification includes airplanes, helicopters, gliders, and drones, representing the opposite of aerostats.
• Aerodynamic — Relating to aerodynamics, concerning the motion of air and gases relative to solid bodies; having a fluid and optimized geometric shape, specially designed to minimize the drag resistance opposed by air during movement. It is widely applied in the design of aircraft, high-speed vehicles, and high-performance sports equipment.
• Aerodynamicist — An engineer or researcher specialized in the field of aerodynamics; a specialist who deals with the study, design, optimization, and testing of the behavior of solid bodies (aircraft, cars, rockets) moving through airflows or gases. This activity includes the use of advanced computer simulations and experimental tests in wind tunnels to reduce drag resistance.
• Aerodynamicist — The feminine form for the term aerodinamician; a female engineer or researcher specialized in the study of aerodynamic forces, the design of aerodynamic profiles, and the optimization of airflows for various vehicles, aircraft, or industrial structures through computational or experimental methods.
• Aerodynamic efficiency — The quality, property, or degree to which a solid object possesses an aerodynamic shape; the structural capacity of a vehicle's body or an aircraft's fuselage to pierce through air layers with minimal drag resistance. Although frequently used in automotive or commercial jargon, the refined technical term 'aerodynamics' is preferred in academic settings.
• Hovercraft — A self-propelled amphibious vehicle (hovercraft) capable of moving at a low altitude above water, land, swamps, or ice, by generating a continuous layer of compressed air beneath its hull (air cushion) which cancels its direct friction with the ground surface.
• To flow toward — To flow or move in a single and constant direction, used especially to describe the movement of liquid masses. In medical and physiological fields, the term defines the process by which blood or other biological fluids gather in much larger quantities in a specific point, organ, or tissue.
• Inflow — The act of flowing or gathering; the massive, continuous, and convergent movement of a fluid, a crowd of people, or goods toward a single point. In medicine, it represents the abundant and rapid accumulation of blood or other biological fluids in a specific organ or tissue.
• Ammoniation — The act of ammoniating and its result; a technological or industrial process through which gaseous or liquid ammonia is introduced into a chemical environment, solutions, or a solid substrate, aiming to modify its acidity, structural reactivity, or nitrogen content. In applied ecology, the term is sometimes used as a partial synonym for ammonification, describing the initial release phase of ammonia from residues.
• Anemography — A branch of meteorology, technique, or experimental methodology dealing with the continuous graphical recording, description, mapping, and structural analysis of wind characteristics (velocity, direction, frequency, and duration) within a specific geographical region.
• Anemometric — Pertaining to anemometry or to an anemometer; relating to the quantitative measurement of wind velocity, pressure, and direction. This structural term describes instruments, sensor networks, or mathematical equations used to evaluate gaseous dynamics.