Plastic is one of the recent engineering materials available in market in various forms to suit many requirements. Plastic is an organic substance and it consists of natural and synthetic binders or resins with or without molding compounds. Rigid Plastics : These plastics have a high modulus of elasticity Soft Plastics : These plastics have a low modulus of elasticity Elastomers : These plastics are soft and elastic materials with low modulus of elasticity Properties of plastics 1. They are light in weight and glossy like glass. 2. They have resistance to corrosion, moisture, chemicals, and solvents. 3. The plastics possess excellent electric insulating properties. 4. Several types of plastics are transparent and translucent. 5. Some plastics have high compressive strength. 6. Melting point of …show more content…
Soda-lime glass (Na2O, CaO, 6SiO2) 2. Potash-lime glass (K2O, CaO, 6SiO2) 3. Potash- lead glass (K2O, PbO, 6SiO2) 4. Common glass Properties of glass 1. It has no definite crystalline structure. It shows amorphous structure. 2. It is very hard and tough, while in solid state. 3. It is extremely brittle. 4. It absorbs, refracts or transmits light. 5. It electrical insulator at elevated temperatures. 6. It is inert to air, water, chemical except alkalis. 7. Possible to weld pieces of glass by fusion. 8. Available in beautiful colors. 9. It can be cast in to any desired shape and size. 10. Can take up a high polish and may be used as substitute for very costly gems 11. As a result of advancement made in the science of glass production, it is possible to make glass lighter than cork or softer than cotton or stronger than
The Glass Castle is a memoir written by Jeannette Walls. The memoir is about her journey growing up in poverty with a dysfunctional family. Jeannette is one of four siblings who all learned how to take care of themselves. Her father was an alcoholic who used the money to buy alcohol instead of caring for his family. When sober, he taught his kids about science and how to be fearless.
Conductor: stranded wires from copper or aluminum with a suitable cross sectional area relating to the ampere of the load 2. Inner semiconductor: uniform and distribute the electric field to prevent interference between
3.1 1. Minerals have a few distinguishing characteristics that differ them from other materials. One of the biggest characteristic that minerals poses is they are naturally occurring, inorganic element or compound. Another is the hardness of the mineral. Minerals also have the characteristics of very different cleavage shapes.
41. selective permeability- the plasma membrane makes it simple for certain molecules to cross, but difficult for other molecules. 42. signal transduction-
The Glass Castle is a memoir written by Jeannette Walls. The book switches back and forth between her childhood adventures and her current life in New York City. During the childhood adventures, Jeannette describes growing up with her mom, Rosemary Walls; her father, Rex Walls; and her three siblings, Lori, Brian, and Maureen Walls. Life is not pleasant or comfortable with this family. They are constantly short on food and money.
UBT1 Task 1: Electricity Introduction What is Electricity? This question is difficult to answer because this is a broad concept of science with multiple definitions. In physics, Electricity is a naturally occurring phenomenon of the flow of electric charge. In other words, the process of attraction and repulsion between electric charges produce electricity. There are two types of charges- negative charges and positive charges.
These rocks come in colours of yellow, pink, pale grey and other light colours. The Glass House Mountains are intrusive plugs, Molten rock filled small vents or intruded as bodies beneath the surface and solidified into hard rocks, also known as Trochyte and Rhyolite. The rocks at the Glass House Mountains are extrusive igneous rocks, meaning that they were former above the ground. The rocks are extrusive as none of them have large crystals, this is because they were cooled too quickly for the crystals to
The Glass Castle The Glass Castle is a memoir by jeannette walls. She writes the story from her perspective showing the reader the challenges she faced due to poverty. One of the many challenges is living with parents who couldn’t keep a job. Alcoholism was a barrier between Rex and his family. although Jeanette’s parents were irresponsible, Lazy and careless, they managed to raise their children into well-educated adults .
Its composition consists of Half Dome Granodiorite, which consists of quartz, feldspar, hornblende, and
My group and I determined that each of the powders state was solid, all of them were a white colour, and they were all opaque. 3. What other physical properties could have helped to identify te mysery powder? Why were these properties not tested in this activity?
Likewise, some things discover during the Renaissance period, have also helped in terms of technology. One example would be the discovery of the printing press. Something that has not only helped people gain easy access to literature and other works of science besides; it has also helped in the production of books. As move into an era of technological advancement, the invention and elements of the renaissance continue to play a significant role in today’s society. Just like Gutenberg sought out to make printing and distribution of literature accessible to much of Europe, so does the inventions today seek to bring forth a rebirth in science, arts, and technology.
Look around, and try to find an everyday object that is not made out of plastic. You should find only a few. Plastic takes up more than 75% of our everyday items… And humans are facing the pollution that plastic is causing to the earth. There isn 't a realistic solution to this, because plastic is used in automobile tires, and also is used in electronic devices, silicon etc.
Do you think Alice Thornton’s proposal to decentralize the rules and procedures of Cosmo Plastics will work? Alice proposal of decentralizing the rules and procedures in Cosmo Plastics has a bigger chance of working out in a big company with different departments and great number of employees, because then daily operations and decision-making are divided into different authorities in the organization from the top managements, to the middle and lower level managements. Especially when you have this flexibility in work hours, because some departments in the company need constant attention and discipline from the side of employees, decentralizing is needed to divide the controlling process. On another scale, small groups will be formed, employees
Introduction: The objective for the lab was to determine properties of materials by using a tension test. The properties that were determined was Young’s Modulus, ultimate tensile strength, and yield strength. Three aluminum alloys were tested. The first was the AA 2024 , which is high strength used in aerospace applications.
The former can be heated and shaped and are used in the modern world many times, containing everything from children's toys to toilet seats. Because they can be melted down and reshaped, thermoplastics are usually recycled. Thermoset plastics can only be heated and shaped once, after which the molecular changes mean they are “cured,” retaining their shape and strength even when they are subjected to intense heat and the pressure. Thermoset plastics plays a vital part in our modern world.