The noise that the plane makes is sometimes so loud that you cannot hear any other noise. Sound is a type of energy. Sounds are produced when an object vibrates. When this happens, the air around the object also vibrates. These vibrations in the air travel as sound waves. A jet engine makes a great deal of sound energy. The engine sounds loud when it is close, but you can sometimes hear the noise when the plane is even several miles away from you.
Definition of Polymer. A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.
Polymers. Polymers polymer: A polymer is a large molecule formed from many identical smaller molecules (monomers). have properties which depend on the chemicals they are made from, and the conditions in which they are made.ulcanised rubber is a thermoset thermoset: Material that becomes permanently hard after heating. used to make tyres. Its polymer chains are joined together by cross-links, so they cannot slide past each other easily. Page: 1  1. 2  2. 3  3. 4  4.