QUOTE(a1098113 @ Feb 29 2008, 03:34 PM)
70% the best?Shoudln't more pure be better like lets say >90%.
Thermal interface material, Discussions on thermal pad/paste/grease
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Feb 29 2008, 05:36 PM
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#1
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Mar 1 2008, 06:43 PM
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QUOTE(a1098113 @ Feb 29 2008, 10:41 PM) noooo nail polish remover... its acetone i think... dont use it Thats where you are very wrong there. Alcohol has high volatility makes alcohol tend to vapourise. Alcohol at high percentage is used as antiseptic and almost pure alcohol(>99%) is used as a cleaning agent. All alcohol burns and ingestion of above 50% alcohol would be enough to kill.Added on February 29, 2008, 10:43 pm well we can but alcohol at that percentage is very volatile... so if u mishandle it it can either explode or do some nasty damage(dryness) to your fingers due to high end evaporation.. |
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Mar 1 2008, 06:58 PM
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QUOTE(a1098113 @ Mar 1 2008, 06:52 PM) are you kidding me? alcohol at high percentages is volatile and dangerous to humans if inhaled. Yes, alcohol is used as antiseptics but more often its normally at 70% concentration, aka, isopyril alcohol. Alcohol vaporizing has nothing to do with its reactive behavior Please la inhaling of 70% alcohol is also bad. Alcohol at 10% is also volatile. Vapourisation is due to it being volatile.Indigestion of alcohol, depends, if u drink in clubs and u had bacardi 151 or absenth, the % of alcohol is at 70%+, so its really on the chemical composition of how the alcohol is derived. You don't need to go clubs for high percentage alcohol, just go make your own illegal rice wine. Ya they probably could go above 60%. We are talking about cleaning compound here and you said 70% was the best which is totally wrong. |
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Mar 2 2008, 12:42 AM
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QUOTE(bryanyeo87 @ Mar 1 2008, 11:01 PM) All alcohol does not burn on its own. But all alcohol above 30% does evaporate when exposed to ambient (more then 0c) temperatures What i mean burn is all alcohol are flammable.Well noone specifically asked you to inhale 70% alcohol from the bottle or from plastic bag right? Normal usage is fine(cleaning etc etc), hell even smelling it is fine, but dont do it excessively la,i wont be responsible for your PHD its not because it is due to vaporisation that it is volatile. It is very molecularly light and due to that it cannot store alot of energy and hence its melting point is -88.8C (184.35 K) and its boiling point is 82.3 °C (355 K) and that is why, when its exposed to ambient temperatures it will vaporize as well as carry a fair bit of energy off the surface it was on, and when its on your hand, its even more faster (hence the cold feeling). What more if it is lit up from a heat? This is referring to Isopropyl alcohol la, where as other types of alcohol are more or less about the same melt and boil point. Isopropyl alcohol cannot be drunk because it has a toxicity almost double of those from beer/wine (lazy to explain), and that is why you can die if you drink it. Illegal rice wine is composed of ethanol, which is of a different substance then "cleaning compound", and different charateristic and and that is the one from beer, wine etc etc, those drinkable ones made from fermentation Alcohol with low percentage do evaporate. Not neccessary above 30%. Volatility in chemistry means the tendency to evaporate. It's boiling point has nothing to do with it's evaporation. It's due to it's low vapor pressure. You can drink isopropyl alcohol but anything above 20ml is toxic. You feel cold when alcohol evaporates on your hand is because evaporation is endothermic thus it absorbs heat energy during it's process to break the bonds. Again back to the discussion is that a forummer on the previous page claims that 70% alcohol is the best cleaning solvent. So what say you? |
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Apr 3 2008, 06:47 PM
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