Over the course of October at London Heathrow Airport, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 54 minutes, implying an average daily decrease of 3 minutes, 48 seconds, and weekly decrease of 26 minutes, 35 seconds.
Polyester is a synthetic fiber derived from coal, air, water, and petroleum. Developed in a 20th-century laboratory, polyester fibers are formed from a chemical reaction between an acid and alcohol.
Key Difference â Polyester vs Silk. Polyester and silk are two types of fabrics that are often used in the textile industry. The key difference between polyester and silk is their origins; polyester is an artificially manufactured fiber whereas silk is obtained from silkworms. Thus, polyester is a synthetic fiber whereas silk is a natural fiber.