Liquids Liquid Pressure Buoyancy Buoyancy is the apparent loss of weight of objects when submerged in a liquid Archimedes' Principle Archimedes' Principle describes the relationship between buoyancy and displaced liquid. Sink or Float? Sinking and Floating Rules:

1. an object more dense than the fluid which it is immersed sinks.

2. an object less dense than the fluid which it is immersed in floats.

3. an object with density equal to the density to of the fluid in which it is immersed neither sinks or floats. The pressure of a liquid at rest depends only on gravity and the density and depth of the liquid. How much a liquid weighs and thus how much pressure it exerts, depends on it's density For any given liquid, the pressure on the bottom of the container will be greater if the liquid deeper. Pressure due to liquid = density x G x depth How much a liquid weighs, and thus how much pressure it exerts, depends on its density. For any given liquid, the pressure on the bottom of the container will be greater if the liquid is deeper The pressure of a liquid at rest depends only on gravity and the density and depth of the liquid pressure due to liquid = density x g x depth If people can't float it is because their mass is too large or the volume of the liquid is to light. Density&Displacement The buoyant force on a submerged object depends on its volume.

-smaller object=smaller displacement of water

-larger object=larger displacement of water Whether an object sinks or floats depends on its buoyant force and weight. Since the volume of objects and of displaced water are equal, the density of the object must equal the density of the water. Density= mass/volume A ship must be designed to displace a weight of water equal to its own weight. The buoyant force is the net upward force exerted by a fluid on a submerged or immersed object. When the wight of a submerged object is greater than the buoyant force, the object will sink. When the weight is less than the buoyant force, the object will rise to the surface and float. A completely submerged object always displaces the volume of a liquid equal to its own volume. Archimedes' principle states that the buoyant force on an immersed object is equal to the wight of the fluid it displaces. Why does this matter? Because water is cool. Bald spot To describe characteristics of liquids and why it acts the way it does.

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# Ch. 19, Liquids

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