Q1: Pick out the wrong statement.

ANS:A - Copper is the metal having the highest electronic conductivity.

Glass transition temperature (Tg) is a crucial property in both polymers and glasses. Here's an explanation:

1. Polymers:
   • In polymers, Tg represents the temperature at which an amorphous polymer transitions from a hard, glassy state to a rubbery or viscous state. Below Tg, the polymer behaves like a rigid solid, while above Tg, it becomes more flexible and exhibits increased molecular mobility.
   • The transition at Tg is associated with the movement of polymer chains from a relatively fixed state to a more mobile state, allowing for increased segmental motion.
2. Glasses:
   • In glasses, Tg also marks a similar transition from a rigid, amorphous solid to a more flexible state. At temperatures below Tg, glasses are in a solid state and exhibit a rigid structure with limited molecular mobility.
   • As the temperature approaches Tg and surpasses it, the glass undergoes a transition to a softer, more flexible state, characterized by increased molecular motion.
3. Importance:
   • Tg is an essential parameter in material processing and applications. It influences the mechanical properties, stability, and processability of polymers and glasses.
   • Understanding Tg helps in determining the service temperature range, thermal stability, and processing conditions for polymers and glasses in various applications.
   • For example, in polymer processing, Tg affects the choice of temperature during molding, extrusion, or annealing processes to ensure desired mechanical properties and structural integrity.