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.
Polyester is a very important manmade fiber. Polyester is produced with a long chain synthetic polymer with ester. Polyester is produced by melt spinning process. Here, I have given physical and chemical properties of polyester fiber which is important to know. Physical Properties of Polyester: Like cotton or other fiber, polyester fiber consists of some important physical properties. Important physical properties of polyester are given below. Tenacity: 5 â 7 gm/den.