Pressure/Density

Pressure/Density

1. Density

   • is the amount of material in a particular volume which allows us to compare the different shapes of materials in Kg/m3 or g/cm3.
   • Density=mass/volume
     • E.G: Aluminium; mass=110g,volume=40cm3,density=110/40=2.750
     • Mass(grams)
     • Volume(cm3)=LxWxH
       • Volume of a cylinder=Pi x r2 x h
         • Used when finding the volume of a liquid
       • Volume of a cube=l x l x l
       • Use Eureka can to find the volume of a uneven solid

2. Pressure

   • is the effect of a force spread out over an area.
   • Pressure= force/area
     • Pressure (N/m2) or (Pascal)
     • Force (Newtons)
     • Area (m2)
   • Pressure under water.
     • Pressure increases with depth (height) of the water, the type of water (density) and the gravitational force.
       • Pressure= Height x Density x Gravitational force
         • Pressure (Pa)
         • Height (m)
         • G ( 10 on earth N/Kg)
         • Density (Kg/m2)
   • Pressure acts in all directions.
   • Experiment to compare pressure in gas and liquid
     • 2 syringes and a tube joining them together with air/water one side and nothing the other.
     • Gas: As the force is applied to the 1st syringe it creates pressure which pushes the air throughout the tube and into the 2nd syringe.
       • Liquid: The liquid acts the same as the gas but moved further because space between molecules cannot be reduced.

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