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FAQ

We had a lab in which we added 2 ml of isoprobyl alcohol to a flask and heated as there was a piece of aluminum with a small hole covering the opening of the flaskThen we had to calculate the molecular mass using the data we had gottenBarometric pressure-764 mm Volume of flask- 144.5 ml mass of alcohol- .37 g and temperature of boiling water 100 CelsiusMy question is why is it not necessary to add exactly 2 ml of isoprobyl alcohol to the flask?

The 2 mL is actually more than is needed to completely fill the flask, pushing all the air out of the flaskThe extra alcohol escapes out the hole in the aluminum foil, leaving behind exactly one flask-ful of vaporSince there is extra alcohol, there is no need to be exact with the amount.

Hey guys, so last year my friend of mine tried an experiment to increase the range of his usb wireless cardThe basic concept was to get the usb card and basically turn it into a mini Satellite as in he drilled a hole into he bottom of a large plastic bowl, coated the inside in aluminum foil, and super glued the usb card inside so that the the back chord would come out the other endhe then mounted it on a tripod he foundthe end result was that he was able to get signals from networks about a mile awayi don't remember the exact way he did it, so if any of you have experimented with something like this or something similar can you please tell me? I'm looking for a way to get some sort of internet access at my school form my laptop, thanks again ]

You can do a Google search for cantenna and find all sorts of interesting ways to make point-to-point unidirectional wi-fi antennasAs an experiment, some workers in our electronic maintenance shop used a big baked beans can, calculated the proper length from the back of the can and proper length of the probe inside the can, and got pretty good range (two bars at three blocks) from an 802.11B network card.

Can I tear the pan down the sides to get the cheescake out? Help! gotta have the cheesecake for Thanksgiving! Do you have any other suggestions?

ok I think it is thoughtful and could workchill it thouroughly before cutting sides because it is firmer.

Making egg dropping container that weighs less than 200 gramsStrict guidlinesPlease help?

You could make a crate out of balsa wood (it's really light) and fill it up with styrofoam, shredded paper, packing peanuts, etcto cushion the eggalso, i would make a lid for the crate and glue styrofoam or bubble wrap to the top of it so that if the crate lands on the lid it'll have some cushioningi hope this is helpful and light enough! good luck! these kinds of projects are really fun: )

I am considering covering the walls in my room with aluminum foil/wrapIs there any reason why I shouldn't do so, in terms of any hazards to myself or objects/devices inside the room? I ask because you know that paper/cardboard are high in acid content and that plastics can deposit oils when heated, so I'm wondering if there were any hazards similar to those involved with aluminum or other metals that I should be aware of?

Physical Properties Of Matter Examples

i have a 3.5 ton a/c unit (the out side part) i want to break it down and recycle it in order to get the most out of it i know theres some copper and aluminium in it so my question isthe fins (i am taling about the out side part that bends easy if you push on it) are aluminium right? the tubes that run thru the quot;finsquot; are copper right? how do i seperate the copper tubes fom the aluminium fins?

Usually, you don't have to strip all the thin aluminum fins off the copper tubes, all you need to do is optionally remove any steel end plates (where the copper tubes make the U turns)If they are steel, and you leave them on, they will call it dirty fins and you will get less moneyIf you want to remove them so you get paid more for clean fins You can take a metal chisel that is sharpened one side, or an OLD wood chisel (you don't care about) and you can go right down both ends and cut off the U turns and then the steel end plates will knock right offIf the end plates are aluminum, you don't need to remove themSave the copper snippets you cut off separate you'll get the 2 copper price for thoseNote that sometimes there is a little oil from the compressor in these tubes so when you cut the ends off it will come out, so you might want to throw some scrap cardboard down first and have a couple paper towels handy when you do thisAlso note that the the terms I used are what my local junkyard calls it, they might have different terms for it at yoursAlso save the various connecting tubes between the compressor, evaporator and condensor, usually these are all copperThe Schrader valves (where gas is put in or pressure tests, AN fitting nuts and any pressure-operated valves in the gas lines are usually brass, so they need to be cut off separateYou don't need to be real careful cutting these apart, they don't mind if there is a little copper in with the brass, but make sure there is no brass in with the copperFor pressure operated freon valves, the diaphragm part is usually steel and unscrews from the brass partThe in-line gas driers/filters (anurizm-like bulges in the tubing), these are sometimes copper sometimes painted or copper-plated steel, so check with a magnet firstIf copper, they need to be cut open and the molecular sieves (round beads) dumped out and brass or steel filter pulled out.

So I made a few papier mache sculptures of African ladies and I used non-acidic paper and tissue, flour and water paste, aluminum foil and wire for the armature, covered the pm in a thin layer of plaster to smooth it out, and I painted over it with acrylics and then sealed it and it also has decorations like glass beads and stone and boneAnd I let it dry good at each stageI like them alot and want them to last for all my life, I'm 16, will they? How long would they last? Is there any way I can make papier mache last longer?

I've just recently given away a mask that I made about ten+ years agoI used news paper and corrugated cardboard to construct the mask,both with high acid pHThe inside and outside were both coated with acrylic paintAnd for the most part the mask is in fairly good condition only suffering from being handled over timeBesides acid levels in the paper probably the biggest concerns would be moisture and insectsAluminum foil should not be of any concernI also have a small dinosaur that someone gave to me probably close to being twenty years old that was made using solid papier mache in pulp formIt was never painted or sealed with anything,collected dust over the years rarely cleaned and has held up very wellIf your sculptures are handled with care I don't see why they would not last.I hope that you enjoy them for many years to come

What are the advantages of carbon-coated aluminum foil in lithium battery applications?

Carbon-coated aluminum foil advantage in the lithium battery applications: 1. inhibiting cell polarization, to reduce thermal effects, improve rate capability; 2. Reduce the battery internal resistance, and significantly reduces the growth cycle of the dynamic resistance;