Term |
Definition |
Fluid |
Nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid |
Pressure |
Amount of force exerted per unit area of a surface |
Pascal |
SI unit of pressure |
Atmospheric Pressure |
Pressure caused by the weight of the atmosphere |
Buoyant Force |
Upward force that keeps an object immersed in or floating on a liquid |
Archimedes' Principle |
Principle that states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces |
Bernoulli's Principle |
Principle that states that the pressure in a fluid decreases as the fluid's velocity increases |
Thrust |
Pushing or pulling force exerted by the engine of an aircraft or rocket |
Drag |
Force parallel to the velocity of the flow; it opposes the direction of an aircraft and, in combination with thrust, determines the speed of the aircraft |
Pascal's Principle |
Principle that states that a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions |
Lift |
Upward force on an object that moves in a fluid |
Atmosphere |
The layer of nitrogen, oxygen, and other gasses that surrounds Earth |
Density |
The amount of matter in a given volume, or mass per unit volume |