Final answer:
The temperature of 100°C causes the polymer in the jaw of the Enseal to melt as the heat applied increases the average kinetic energy, leading to the breakdown of the solid structure and transition to liquid.
Step-by-step explanation:
When the temperature of the polymer in the jaw of the Enseal reaches 100°C, it melts. As with most materials, the process of a solid polymer liquefying upon the application of heat is referred to as melting. For polymers, this process involves an increase in the average kinetic energy of its atoms, molecules, or ions, causing the solid structure to break down and transition into a liquid state. This melting point occurs when the added energy disrupts the organization of particles and overcomes the attractive forces within the solid polymer. It's important to note that different polymers melt at different temperatures depending on their molecular structure and the strength of the forces holding the solid together.