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6Sciencechapt7
Vocabulary 6th Grade Chapter 7
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 |