Polymer Definition:

A polymer is a large molecule composed of repeating structural units known as monomers. These monomers are chemically bonded together to form a long chain, which gives polymers their unique properties.

Characteristics of Polymers:
- Polymers are made up of long chains of monomers.
- They have high molecular weights.
- Polymers can be natural (like proteins and DNA) or synthetic (like plastics and synthetic fibers).
- They have diverse properties such as flexibility, strength, and durability.

Types of Polymers:
- Natural Polymers: Examples include proteins, DNA, cellulose, and rubber.
- Synthetic Polymers: Examples include plastics like polyethylene, polypropylene, and polystyrene, as well as synthetic fibers like nylon and polyester.

Uses of Polymers:
- Polymers are used in a wide range of industries such as packaging, construction, textiles, and healthcare.
- They are used to make everyday items like plastic bottles, clothing, medical devices, and automotive parts.

NCERT Solution - Synthetic Fibres & Plastics:

Synthetic Fibres & Plastics is a chapter in the NCERT textbook for Class 8 Science. It covers topics such as different types of synthetic fibers (like nylon, polyester, and acrylic), the properties of synthetic fibers, and the uses of synthetic fibers in various industries. The chapter also discusses the properties of plastics, the different types of plastics, and their uses in everyday life.

In this chapter, students learn about the importance of synthetic fibers and plastics in our modern world, as well as the environmental impact of their production and disposal. By studying this chapter, students gain a better understanding of the role of polymers in society and how they have revolutionized various industries.