# Buoyancy

## Buoyancy

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##### Presentation Transcript

1. Buoyancy

2. Archimedes Principle • Archimedes' Principle: When an object is partially or fully submerged, the buoyant force, or the apparent loss in weight, is equal to the weight of the fluid displaced. Buoyancy:  Buoyancy is a force exerted on an object in a fluid environment (this includes air). This results in the object going up and opposing gravity.   • Affect: An object may have positive buoyancy, if the pressure below the object is larger then the pressure above the object, then object will rise. • Apparent weight: The apparent weight equals the actual weight minus the buoyant force. • Affect: In order to have buoyancy an object must have a lower average density then the fluid it is in.

3. Avogadro’s Principle •  Avogadro's law: Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. •   Affect: Two tanks of equal volume at the same temperature and pressure contain the same number of molecules regardless of what gas they are. • However: In order for it to be convenient, chemists have chosen one temperature and one pressure as a standard, chemists have chosen 1 atm to be the standard pressure and 0°C to be standard pressure temperature. These conditions are called STP                    (Standard Temperature and Pressure) •  1 mole (6.02 ×10    molecules) of any gas at STP occupies 22.4 L