1. The problem statement, all variables and given/known data Why is there such a large difference between the elastic moduli of metals and polymers? 2. Relevant equations 3. The attempt at a solution I am thinking because of the different bonding between metals and polymers. Since metals have metallic bonding and polymers have different bonding (Covalent or Hydrogen bond? I am so sure about this) which is much weaker than metallic bonding, so it is much easier to stretch polymers. Is this correct? Thank you!