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Polypropylene is the second-most widely produced (after ). chemists and first demonstrated the polymerization of propylene in 1951. The stereoselective polymerization to the isotactic was discovered by and Karl Rehn in March 1954. This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm ...
The International Radiotelephony Spelling Alphabet or simply Radiotelephony Spelling Alphabet, commonly known as the NATO phonetic alphabet, is the most widely used set of clear-code words for communicating the letters of the Roman alphabet. Technically a radiotelephonic spelling alphabet, it goes by various names, including NATO spelling ...
Polyethylene terephthalate (or poly (ethylene terephthalate), PET, PETE, or the obsolete PETP or PET-P ), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. [5]
Plastic. Household items made of various types of plastics. Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be molded, extruded or pressed into solid objects of various shapes. This adaptability, plus a wide range of other properties ...
The Mount Edziza volcanic complex (MEVC) is a group of volcanoes and associated lava flows in northwest British Columbia, Canada. Located on the Tahltan Highland, the MEVC has a broad, steep-sided lava plateau; its highest summit is 2,786 metres (9,140 feet). Its volcanoes formed over the last 7.5 million years during five cycles of magmatic ...
ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .
Amelia Mary Earhart ( / ˈɛərhɑːrt / AIR-hart; born July 24, 1897; declared dead January 5, 1939) was an American aviation pioneer. On July 2, 1937, Earhart disappeared over the Pacific Ocean while attempting to become the first female pilot to circumnavigate the world. During her life, she embraced celebrity culture and women's rights, and ...
General George C. Marshall, the 50th U.S. Secretary of State. The Marshall Plan (officially the European Recovery Program, ERP) was an American initiative enacted in 1948 to provide foreign aid to Western Europe. The United States transferred $13.3 billion (equivalent to $173 billion in 2023) in economic recovery programs to Western European ...