using resources

• potable water is safe to drink but it is not pure as it contains dissolved substances
• most potable waters made by

  • appropriate source of fresh water
  • passing through filter beds
  • sterilizers(uv, chlorine, ozone)
• sea water is desalinated via distillation using membranes like reverse osmosis
• sewage is made into potable water by

  • screening/grit removal
  • sedimentation
  • anaerobic digestion
  • aerobic treatment
• alloys contain other metals
• glass is made from sand sodium carbonate and limestone
• ldpe and hdpe are polymers that depend on monomers and are made from ethane
• thermosoftning melt when heated thermo setting do not
• a composite material is two materials mixed together one typically used as reinforcement