Poly used fro reainwater explain the reasons?Some guttening made from iron explain why polythene a better ?
925947
Before the introduction of plastics in the building industry, cast iron, pressed steel and zinc were in common use for gutters and rainwater pipes.  When plastics were developed, PVC became the preferred plastic due to its lightness, ease of installation and resistance to deterioration. In my experience the time taken to fit plastic materials is approximately half to one third that of traditional materials.  Plastics are also smooth on the surface reducing resistance and allowing  water to flow more freely.
522225
Polyethylene is commonly used, sometimes "foamed" to lower the loss factor.\n\nThe best cable employs Teflon.\n\nHigh power transmitting cables have a minimum number of discrete spacers to maintain the geometry.
1037023
Water, when heated from a solid to liquid state, but ultimately in a gaseous state it again expands.  It still obeys all the laws of chemistry, but the bonds just arrange themselves in a more space efficient manner in liquid than in solid form.\n\nAnd moses with a P, no metals exist with the properties you say.  It is physically impossible, sorry man, but I'm a biochem major and it's my job to know what stuff does under different stresses, and nothing does what you claim.  However, if you do have a material that does this, get in touch with me, we'll talk to the patent office, and we'll license it out to companies for billions of dollars.
662574
It might be due to the number of unpaired electrons which causes a large amount of net magnetic moment making the material more magnetic.  This is the property of a ferro magnetic material.
600262
They both dissociate completely in water, but sulfuric is technically the stronger acid.  I think that that's what they use for metal etching as a matter of fact, but I could be wrong.  Anyway, metal would be more adversely affected by sulfuric, as would flesh (although they both hurt pretty freaking bad).  I'm sure it's the same with plastic.  A better way to dissolve plastic, though, is organic solvents such as THF.
430573
Paper has always been used as a alternative material for making bags because they biodegrade better than most plastics, but recent discoveries has allowed for making plastic out of more ecologically-friendly materials that biodegrade after exposure to the elements. Though the process is much slower than paper's decomposition, it's still an improvement. As for other plastic items like bottles, there's a reason why we try to gather them for recycling! After all, the material would just go to waste if we dump it and just let it literally rot in the dump. But through recycling, we can actually ensure that they are processed for reuse instead of just being wasted. Recycling, however, is subject to the availability of facilities within the community--certain countries like Japan tend to have advanced recycling facilities while less developed countries don't. Then it's up to the community citizens to speak up and demand less wastage and more recycling!
215768
Why not just cook in an iron skillet, its cheaper provides iron to all food cooked in it, and stuff tastes good.
716910
Check the link below.  It can be formed through volcanic activity as well as crystallizing out of mineral rich water deposits.  It is almost pure iron that is oxidized.
364182
You should look up the numbers.  Off the top of my head, I think nylon is used for ropes because it has good tensile strength.
677687
There are many things that can be used including alum and ferric salts.  The best thing and the first thing I fix at a plant is to make sure the rest of the treatment system is working properly.  90% of the time, that alone will cause a decrease in the use of polymer and allows the use of a mineral salt treatment.  I do this work around the world.  The main use of the organic polymers for coagulation is simplicity of operation, cost, but mostly good salemanship.  You can cover up many bad operations by adding more polymer.\n\nGum will probably not work.  There are many things tried, but most of them do not overcome the good operations and cost issues.
1093693
Probably because it is cheaper and reusable.
564352
what iron? i don't think iron should be in pool water. when i treat my pool, its always ok. you should talk to the people who built your pool or go to a pool supply shop and ask them about it.
114791
Actually coca-cola cleans better the metal, because contains phosporic acid a more stronger acid that the acids on the "natural" fruit juice.
579981
Iron and water.  Just wash the sand off the iron.
133760
The Iron content in Stainless steel is less than other steel alloy\nThe Cromium Content is more\nCr is not a ferromagnetic matter So Stainless steel is not ferromagnetic
440239
It Depends on what gains more importance,\n1) If you what it to be rigid & give a good look then ABS will be good,\n2) If you want it to be soft than PP (Polyproplene) is good,\n3) If you what it to be heat resistant & high stength then Bakalite (Thermoset plastic) will be good
723937
copper. because it can oxidize easier. That is why statue of liberty is green.