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Guru Penolong Kanan (Assistant Principal/Headmaster) of primary and secondary school. Sometimes it can be referred as Timbalan Pengetua or Penolong Pengetua. Ketua Bidang (Headteacher) of an academic field in secondary school. It can be referred sometimes as Ketua Jabatan (Head of Department). Ketua Panitia (Course Leader) in primary and ...
Binders are loosely classified as organic (bitums, animal and plant glues, polymers) and inorganic (lime, cement, gypsum, liquid glass, etc.).These can be either metallic or ceramic as well as polymeric depending on the nature of the main material.
Colors of a single chemical in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environmentIn addition to the generic definition offered above, there are several niche fields where the term "chemical substance" may take alternate usages that are widely accepted, some of which are outlined in the sections below.
At the microscopic and macroscopic levels, porous media can be classified. At the microscopic scale, the structure is represented statistically by the distribution of pore sizes, the degree of pore interconnection and orientation, the proportion of dead pores, etc. [4] The macroscopic technique makes use of bulk properties that have been averaged at scales far bigger than pore size.
PVC was synthesized in 1872 by German chemist Eugen Baumann after extended investigation and experimentation. [12] The polymer appeared as a white solid inside a flask of vinyl chloride that had been left on a shelf sheltered from sunlight for four weeks.
The word plastic derives from the Ancient Greek πλαστικός (plastikos), meaning 'capable of being shaped or molded'; in turn, it is from πλαστός (plastos) meaning 'molded'. [10]
Sulfur at harbor in North Vancouver, British Columbia, ready to be loaded onto a ship Latex being collected from a tapped rubber tree. A raw material, also known as a feedstock, unprocessed material, or primary commodity, is a basic material that is used to produce goods, finished goods, energy, or intermediate materials that are feedstock for future finished products.
Naturally occurring radioactive materials (NORM) and technologically enhanced naturally occurring radioactive materials (TENORM) consist of materials, usually industrial wastes or by-products enriched with radioactive elements found in the environment, such as uranium, thorium and potassium-40 (a long-lived beta emitter that is part of natural potassium on earth) and any of the products of the ...