Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in plants and insects, as well as synthetics such as polybutyrate.
Deutsch: Preis (Wirtschaft) / Español: Precio / Português: Preço / Français: Prix / Italiano: Prezzo
In ordinary usage, price is the quantity of payment or compensation given by one party to another in return for goods or services.
In modern economies, prices are generally expressed in units of some form of currency. (For commodities, they are expressed as currency per unit weight of the commodity, e.g. euros per kilogram.)
Deutsch: Polymer / Español: Polímero / Português: Polímero / Français: Polymère / Italiano: Polimero
A polymer is a large molecule composed of many repeated subunits, known as monomers. Because of their broad range of properties, both synthetic and natural polymers play an essential and ubiquitous role in everyday life. Polymers range from familiar synthetic plastics such as polystyrene (or styrofoam) to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function.
Deutsch: Pulver / Español: Polvo / Português: Pó / Français: Poudre / Italiano: Polvere /
In the industrial context, 'powder' refers to a finely divided substance that is made up of particles that are smaller than grains of sand. Powders can be made from a wide range of materials and are used in many different industries, including food and beverage, pharmaceuticals, cosmetics, and manufacturing.
Deutsch: Planung / Español: Planeamiento / Português: Planejamento / Français: Planification / Italiano: Pianificazione
Planning (also called forethought) is the process of thinking about and organizing the activities required to achieve a desired goal. It involves the creation and maintenance of a plan, such as psychological aspects that require conceptual skills. There are even a couple of tests to measure someone's capability of planning well. As such, planning is a fundamental property of intelligent behavior.