density of materials

• density formula


  density kg/m*3 = mass kg / volume m*3
• density of an object depends on


  what its made of

  how particles are arranged
• how are particles arranged in a solid


  strong forces of attraction

  particles are very close together

  fixed regular and pattern

  they vibrate but dont move

  highest density
• how are particles arranged in a liquid


  weaker forces of attraction

  particles are close together

  no regular pattern

  can move around

  less dense than solids
• how are particles arranged in a gas


  almost no force of attraction

  very far apart

  no pattern

  move in random directions at high speeds

  lowest density
• what type of density solids have


  very high

  particles are closely packed together

  lots of mass for their volume
• what type of density do liquids have


  high density

  particles are less close together

  a lot of mass for their volume
• what type of density do gases have


  low density

  particles are far apart

  only have a small mass for their volume
• density definition


  substances mass per unit volume

  • low density = low mass
  • high density = high mass
• polysterene


  a solid with a low density

  -open structure with air spaces

  -small mass for its volume
• measuring density of a regular solid object


  -use a mass balance to measure mass

  -measure length width and height and calculate volume

  -use the density is equal to mass over volume formula to calculate density
• measuring density of an irregular solid

  -use a mass balance to measure mass

  -find volume by submerging an object into a eureka can filled with water

  -transfer displaced water to a measuring cylinder and record its volume

  -use formula to calculate density
• measuring density of a liquid


  -place a measuring cylinder on mass balance

  -pour 10 ml of liquid and measure mass

  -repeat till cylinders full and record volume and mass each time

  -calculate density

  -find an average value