Many polymer properties are affected by the length of the polymer chains. For example, the melting temperature increases with increasing molecular weight. At room temp, polymers with very short chains (roughly 100 g/mol) will exist as liquids. Those with weights of 1000 g/mol are typically waxy solids and soft resins. Solid polymers range between 10,000 and several million g/mol. The molecular weight affects the polymer’s properties (examples: elastic modulus & strength).