Density & Pressure

• Density is the mass of a given volume of a substance
• Density in kg/m3, Mass in kg, Volume in m3
• Density depends on the state of a substance
• In solids the particles are packed close together

  
• In liquids the particles are close together and move around each other

  
• In gasses the particles are far apart and move quickly in all directions

  
• Solids are usually denser than liquids
• Liquids are usually denser than gasses
• Pressure is the force per unit area
• Pressure in N/m2, Force in N, Area in m
• Density = Mass/Volume

  
• Pressure = Force/Area