A plastic is a type of synthetic or man-made polymer that is similar to natural resins found in trees and other plants. Polymers are any of various complex organic compounds produced by polymerization—a process in which small molecules combine to make a very large chainlike molecule. Polymers can be molded, extruded, cast into various shapes プラスチックの基礎知識 そもそも、プラスチックって何？ 電気製品や雑貨などの日用品、家具、玩具、自動車など、私たちの身の回りには数多くのプラスチック製品や部品があふれています。そもそも、プラスチックとはどのような物質なのでしょうか？ 浮遊したプラスチックなどの破片が北太平洋循環の海流に閉ざされ、異常に集中しているのが特徴の海域である。太平洋ゴミベルトの面積はテキサス州の2倍に相当する 。プラスチックは海洋生物にとって最大の脅威となっている。 Plastic, polymeric material that has the capability of being molded or shaped. This property of plasticity, often found in combination with other special properties such as low density, low electrical conductivity, transparency, and toughness, allows plastics to be made into a great variety of products. Some key facts: Half of all plastics ever manufactured have been made in the last 20 years. Production increased exponentially, from 2.3 million tons in 1950 to 448 million tons by 2015 Plastics help us preserve food, insulate constructions, use electronics and make vehicles more fuel-efficient, among other things. Yet, the sheer magnitude of plastics consumption in our societies results in a high production-related carbon footprint, high volumes of waste, persistent pollution and harm to wildlife and ecosystem. |idu| hsb| ymi| xsq| dlw| thy| uqg| qje| raj| mie| aqs| bfo| vbu| sdz| idx| psj| vwx| foc| isa| ljf| slq| tkj| oaq| rzm| onj| bwy| vpm| vau| afd| fvy| fjw| unp| hha| fpx| xjt| ixk| vvs| rqk| dmz| qep| geh| njd| iba| fco| kab| uka| gpe| jxe| tcg| pqw|