Molecules of air, for example, are surrounded by air. All matter consists of molecules. Size of Molecules Atoms and inorganic molecules are the size of dust particles or can be seen with a microscope. Most inorganic molecules are too small to see by any known means.
Gases have no weight.
Science Book . Alternative ideas are known by many names including alternative conceptions, misconceptions, and naive ideas. They have been extensively studied during the past 15 years. This does not imply that all prior knowledge is faulty. Students have a great deal of valuable prior knowledge.