Expanded form decimals Video transcript Let's say I have the number So how could I expand this out? And what does this actually represent? So let's just think about each of the place values here.
Decomposition X years, still decaying Polystyrene is commonly injection moldedvacuum formedor extruded, while expanded polystyrene is either extruded or molded in a special process. Polystyrene copolymers are also produced; these contain one or more other monomers in addition to styrene.
In recent years the expanded polystyrene composites with cellulose   and starch  have also been produced. Polystyrene is used in some polymer-bonded explosives PBX. Sheet or molded polystyrene[ edit ] CD case made from general purpose polystyrene GPPS and high impact polystyrene HIPS Disposable polystyrene razor Polystyrene PS is used for producing disposable plastic cutlery and dinnerware, CD "jewel" casessmoke detector housings, license plate frames, plastic model assembly kits, and many other objects where a rigid, economical plastic is desired.
Polystyrene Petri dishes and other laboratory containers such as test tubes and microplates play an important role in biomedical research and science. For these uses, articles are almost always made by injection molding, and often sterilised post-molding, either by irradiation or by treatment with ethylene oxide.
Post-mold surface modification, usually with oxygen -rich plasmasis often done to introduce polar groups. Much of modern biomedical research relies on the use of such products; they therefore play a critical role in pharmaceutical research.
Grey polystyrene foam, incorporating graphite has superior insulation properties. Foams are also used for non-weight-bearing architectural structures such as ornamental pillars.
Thermocol slabs made of expanded polystyrene EPS beads. The one on the left is from a packing box. The one on the right is used for crafts. It has a corky, papery texture and is used for stage decoration, exhibition models, and sometimes as a cheap alternative to Shola Aeschynomene aspera stems for artwork.
The larger spheres are expanded polystyrene beads which were compressed and fused together. The bright, star-shaped hole at the center of the image is an air-gap between the beads where the bead margins have not completely fused. Each bead is made of thin-walled, air-filled bubbles of polystyrene.
EPS is used for food containersmolded sheets for building insulationand packing material either as solid blocks formed to accommodate the item being protected or as loose-fill "peanuts" cushioning fragile items inside boxes.
Due to its technical properties such as low weight, rigidity, and formability, EPS can be used in a wide range of applications. Typical values range from 0.
The value of 0. Adding fillers graphites, aluminium, or carbons has recently allowed the thermal conductivity of EPS to reach around 0.
The boards containing a flame retardant when tested in a tunnel using test method UL or ASTM E84 will have a flame spread index of less than 25 and a smoke-developed index of less than EPS blocks or boards used in building construction are commonly cut using hot wires.
Styrofoam Extruded polystyrene foam XPS consists of closed cells, offers improved surface roughness and higher stiffness and reduced thermal conductivity. Extruded polystyrene material is also used in crafts and model building, in particular architectural models.
Because of the extrusion manufacturing process, XPS does not require facers to maintain its thermal or physical property performance.
Thus, it makes a more uniform substitute for corrugated cardboard. Thermal conductivity varies between 0. Water absorption of polystyrene foams[ edit ] Although it is a closed-cell foam, both expanded and extruded polystyrene are not entirely waterproof or vaporproof.
If the water freezes into ice, it expands and can cause polystyrene pellets to break off from the foam. Extruded polystyrene is also permeable by water molecules and can not be considered a vapor barrier. Copolymers[ edit ] Pure polystyrene is brittlebut hard enough that a fairly high-performance product can be made by giving it some of the properties of a stretchier material, such as polybutadiene rubber.
The two such materials can never normally be mixed because of the small mixing entropy of polymers see Flory-Huggins solution theorybut if polybutadiene is added during polymerisation it can become chemically bonded to the polystyrene, forming a graft copolymer ,[ citation needed ] which helps to incorporate normal polybutadiene into the final mix, resulting in high-impact polystyrene or HIPS, often called "high-impact plastic" in advertisements.
Common applications of HIPS include toys and product casings. HIPS is usually injection molded in production. Autoclaving polystyrene can compress and harden the material.
Several other copolymers are also used with styrene. Most electronics cases are made of this form of polystyrene, as are many sewer pipes. Styrene can be copolymerized with other monomers; for example, divinylbenzene can be used for cross-linking the polystyrene chains to give the polymer used in Solid phase peptide synthesis.
Oriented polystyrene[ edit ] Oriented polystyrene OPS is produced by stretching extruded PS film, improving visibility through the material by reducing haziness and increasing stiffness.Improve your math knowledge with free questions in "Convert from expanded form" and thousands of other math skills.
Sometimes called “compassionate use”, expanded access is a potential pathway for a patient with an immediately life-threatening condition or serious disease or condition to gain access to an.
An interactive math lesson about Place Values. Each digit of a number, such as ,, has a different place value name. Place Value Worksheets Expanded Form with Integers Worksheets. These Expanded Form Worksheets are great for testing children on writing numbers out in expanded form.
Polystyrene (PS) / ˌ p ɒ l i ˈ s t aɪ r iː n / is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and rather brittle.
It is an inexpensive resin per unit weight. Polystyrene (PS) / ˌ p ɒ l i ˈ s t aɪ r iː n / is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and rather brittle.
It is an inexpensive resin per unit weight.