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The word plastic draws from the Ancient Greek πλαστικός (plastikós), which means 'to mold' or 'to shape'. [3] It has long preceded its dominant modern meaning as a synthetic material. The term plastic arts has been used historically to denote visual art forms (painting, sculpture, and ceramics) as opposed to literature or music.
The origins of the planetary symbols can be found in the attributes given to classical deities. The Roman planisphere of Bianchini (2nd century, currently in the Louvre, inv. Ma 540) [2] shows the seven planets represented by portraits of the seven corresponding gods, each a bust with a halo and an iconic object or dress, as follows: Mercury has a caduceus and a winged cap; Venus has a ...
In shallow drawing, the depth of drawing is less than the smallest dimension of the hole. Bar, tube, and wire drawing all work upon the same principle: the starting stock is drawn through a die to reduce its diameter and increase its length. Usually, the die is mounted on a draw bench. The starting end of the workpiece is narrowed or pointed to ...
The current Venusian atmosphere has only ~200 mg/kg H 2 O(g) in its atmosphere and the pressure and temperature regime makes water unstable on its surface. Nevertheless, assuming that early Venus's H 2 O had a ratio between deuterium (heavy hydrogen, 2H) and hydrogen (1H) similar to Earth's Vienna Standard Mean Ocean Water of 1.6×10 −4, [7] the current D/H ratio in the Venusian atmosphere ...
In the latter half of the century, plastic technology advanced so that it was feasible for artists to start using plastic and acrylics as an artwork medium. Artist Roxy Paine created a sculpture-making machine "Scumak No. 2": [2] a large metal contraption that oozed acrylic on to a conveyor belt that jiggled slowly back and forth. The barely ...
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
For the same reason, graphite on the surface tends to smear; there are polyester pencil drafting leads available as a substitute for graphite for drawing on drafting film. [5] Different matte coatings (generally consisting of amorphous silica particles dispersed in a resin) are better suited for graphite or for polyester leads.
The plastic industry includes the global production, compounding, conversion and sale of plastic products. Although the Middle East and Russia produce most of the required petrochemical raw materials, the production of plastic is concentrated in the global East and West. The plastic industry comprises a huge number of companies and can be ...