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Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO).
The strength and durability of aluminium alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminium a bad reputation.
One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings. This implies that engineers must assess these loads and design for a fixed life rather than an infinite life.
Another important property of aluminium alloys is their sensitivity to heat. Workshop procedures involving heating are complicated by the fact that aluminium, unlike steel, melts without first glowing red. Forming operations where a blow torch is used therefore require some expertise, since no visual signs reveal how close the material is to melting. Aluminium alloys, like all structural alloys, also are subject to internal stresses following heating operations such as welding and casting. The problem with aluminium alloys in this regard is their low melting point, which make them more susceptible to distortions from thermally induced stress relief. Controlled stress relief can be done during manufacturing by heat-treating the parts in an oven, followed by gradual cooling—in effect annealing the stresses.
The low melting point of aluminium alloys has not precluded their use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region.
Another alloy of some value is aluminium bronze (Cu-Al alloy).
Aluminium foil acts as a total barrier to light and oxygen (which cause fats to oxidise or become rancid), odours and flavours, moistness, and germs, it is used broadly in food and pharmaceutical packaging. The purpose of aluminium is to make long-life packs (aseptic processing|aseptic packaging) for drinks and dairy goods, which allows storing without refrigeration. Aluminium foil containers and trays are used to bake pies and to pack takeaway meals, ready snacks and long life pet foods.
Aluminium foil is widely sold into the consumer market, often in rolls of 500 mm (20 in) width and several metres in length.It is used for wrapping food in order to preserve it, for example, when storing leftover food in a refrigerator (where it serves the additional purpose of preventing odour exchange), when taking sandwiches on a journey, or when selling some kinds of take-away or fast food. Tex-Mex restaurants in the United States, for example, typically provide take-away burritos wrapped in aluminium foil.
Aluminium foils thicker than 25 μm (1 mil) are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.
- Q:My cat, Callie, was adopted from a local shelter almost two years agoThe shelter wasn't taking very good care of her (and they were overrun with kittens) so we brought her home with usI realized just recently that she is terrified of aluminum foilAs soon as I open the cupboard that contains the box, she'll freeze in the midst of whatever she's doing and run away as soon as I pull the box outI've never personally harmed her with it, nor has anyone in our family, so I don't know what her fear isI did a little research on this before I decided to ask all of you, and I discovered that some cats just don't like the soundI would have accepted this if it weren't for the fact that my other cat has no problem with itYou would think she would, but she's perfectly alright with itIt's just Callie that's afraidI don't know if something happened in the shelter she came from, but I wouldn't put it past those people, especially considering the condition of the shelterAny answers would be helpful! Thanks!
- I've had cats afraid of the sound of plastic bags rustlingI guess it's one of those fingernails on a chalkboard kind of thing for some catsYou might try some exposure therapy training if you want to see if you can help her overcome the fearOr if you don't think it's too bad or you can cope with it, then just let it beYou can use behavior training to acclaimate a cat to a sound or other disturbing thingBut it can take time, love, and consistency Mekittyslave23I know my place.
- Q:AlrightI have a few things I need to do, and I'm not sure how to go about doing themthat's why I'm here! Your help would be appreciated :]First thing I'm supposed to do is figure out whether the following list is in order of increasing or decreasing ionic radiusHow would I know? If you could tell me how that'd be great :]Here it is:7N^3- 8O^2- 9F^- 11Na^+ 12Mg^2+ 13Al^3+And I'm also supposed to figure out the number of electrons in each of the ions aboveHow do I do that? Chemistry is not my forteeheh ~_~Best answer to whomever :]
- the more shells the wider the radiusso first write out the electronic configuration for each so that is : nitrogen - 2:5.7 electrons .oxygen - 2:6.8 electrons sodium 2:8:1.11 electronsmagnesium - 2:8:2.12 electrons aluminium - 2:8:3.13 electronsin the order of smallest radius to largest radius is: nitrogen ,oxygen,sodium,magnesium,aluminium
- Q:I am designing a model rocket and was unsure of what it was because I was going to use it as a fuel other wise where can i find hydrocloric acid
- Hydrochloric acid is also sold as muratic acidYou can buy it relatively pure at most hard ware stores for lowering the pH of swimming poolsHow do you plan on collecting this gas? With a balloon? If so you need to neutralize the gas by making a double reactor systemIn the first bottle you have your aluminum and HCl, a tube leading out of this bottle and into a bottle with some baking soda and waterThe gas bubbles up through the baking soda solution to neutralize the HClThen into your balloonIf you don’t neutralize the gas, the acid will attack the rubber in your balloonBalloon goes pop before the gas does no funSodium hydroxide also reacts with Aluminum to form hydrogenRed Devil still makes a drain cleaner that is pure sodium hydroxideThen you have to neutralize that gas with vinegarSame system different solutionsHave fun.
- Q:I need to make a fairly accurate construction of a monkey and i dont want to use plasticine or play-dohWhat are some different options and materials?
- Scrunch up aluminium foil into various shapes and assemble to form a basic monkey shape - that will be the the core Next apply paper mache to form the actual surface that will make up your monkey
- Q:I don't have a nonstick cookie sheet, but I do have parchent paper, aluminum foil and wax paper.what would work best to simulate a non-stick surface?
- Parchment paper would do the trick or grease a baking tray
- Q:Can you tell me how to get number of valence electrons?Im in 8th Grade can you tell me in small words im not that stupid though but can you tell me how to tell it step by step.I need to find Number of Valence Electrons of Aluminum tell me what the Valence electron and how to do it.
- Valence electrons are the electrons in the shell furthest from the nucleus(the last shell)Aluminum has 13 protonsTwo protons fill the first shell, eight fill the second shell, and three fill the last oneThat uses up all 13 protonsAluminum has 3 valence electrons(the 3 electrons in the final shell)Keep in mind you can only put two protons in the first shell, and eight in the other shells.
- Q:How many vaccines/shots does he have to have and things like that? Also neutering costsThe total please.
- You will need to buy a litter box, which will cost about $10 if you get a cheap one, $25 if you get a nice, covered one (which I suggest-no one wants to look at poo.) Litter is extremely cheap; about $5 for 10 lbsYou will also need to buy food, which is about $4 for 3 pounds, if you get the cheap stuff (most cats are ok with the cheap stuff, no matter what other people say.) You'll need food and water bowls too, though you could really just use Tuperware dishes if you had toThe kitten will need toys, but if you're strapped for cash, you can give it things like old shoelaces, cardboard boxes, (paper!) bags, and aluminum foil wadded up into a ballMy cats love these thingsAs far as the medical side goes, it probably is best to take it to a vet.
- Q:Found an idea on Pinterest for Pinata cookies, but I need a donkey cookie cutter! A horse could work, but I really would prefer a donkey one! Having a fiesta-themed party in the summer so I am trying to get stuff in advance! Anyone know any major companies/store chains that sell donkey cookie cutters? Please answer with a link to the store! I don't like buying from small, unknown companies unless it is absolutely necessary (which it may have to be!) Please answer ASAP :)
- look at Kitchen Shoppe, other kitchen specialty stores, Wilton shelves in Walmart, or find a coloring book and cut both ends out of aluminum can and shape to match the donkey on the coloring book using pliers to bend the can.
- Q:I was opening of some coaxial cable to see what all was insideThere was some wire braid/mesh running the length of the cable just inside the outer layer and I heard of it being made of copper, but mine was notIt looked sort of like aluminum but I am not sureI am just wondering what other metals are used to make the wire braid.
- Pretty much what binka saidNone of the other people that answered didn't even remotely answer your QlolYour probably already know what the foils were for or you would not be asking about the heat thingAlso like binka said if your hair isn't taking the bleach well your can put heat on it for about 30 secondsI go get my hair bleached all the time and they do put me under that dryer thing to speed up the processIt also makes it not so orangy looking if your hair just stops at that stage thats in between brown and blonde.
- Q:why is Aluminium oxide insoluble in water?
- 1) Sharpie Black marker under their noseDraw them a moustache, a beard, and raised eyebrowsGive them a third eye2) Warm Water + hand wet the bed 3) Duck tape him to the bed, THEN fill his hand with shaving cream, and tickle his noseHe will try so hard to get that thing off his nose that he will rip through the duck tape and smash the shaving cream into his face4)if this is college humor, than gently carry him outside, in a sleeping bag, and put him under a tree, or on a car, or somewhere randomWhen he wakes up he will be like where the hell am I? 5) Decorate the room to make it look like a massacre happenedDecorate the walls with (fake) blood, rip pillows, and lie on the ground covered in bloodPut a knife covered in fake blood in his handsHe will wake, and he will see that he entire room is covered in blood, execpt for him and his bed 6) Put a wedding ring on his handTape a note somewhere he will see it, and write on it something a female would say, like I'm so excited to be starting our new life togetherPut a bunch of beer bottles in his bedHe will be clueless until he spots, and feels the ring on his hand7) Put on the creepiest and scariest mask you can imagine, and stand over the bed with a knife glistening in your handMake sure you have giant eyesPut your face a centimetre away from hisWhen he wakes, he will have a heart attack8)Post an Eviction notice on his pants9) Put a bra around him and put panties onMore beer bottles places conviently around the room, additionally with a note stuck to him saying I never knew you were gay/bisexual/whatever! Thank god for last night! should convince him he had a hell of a party last night 10) Place him under his bed, and let his blankets droop over the side so when he wakes it will be completely darkAlthough this will not sound scary, when he wakes up, he will see dark everywhereHe will straighten up only to crack his head on his bedHe will think he is trapped, underground.
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foil aluminum
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