Density

• Why Do Some Plastics Float While Others Sink?
  Plastic does not always float: polyethylene and polypropylene are less dense than water, while PET and PVC often sink unless air or shape adds buoyancy.
• Density vs. Mass Density: What Is the Difference?
  Density usually means mass per unit volume in basic physics, but the term also applies to other quantities; context and units clarify which one.
• Can You Convert Mass Percent to Solution Density?
  Mass percentage alone cannot determine solution density. Learn what additional volume, temperature, or reference data you need and how to calculate it.