the pharmaceutical companies already do vacuum stoppering and shelf life product extension with vacuum storage and , there are a global network of metallury oxide free welding..commonly known as electron beam welding and vacuum brazing ovens and heat treatment in vacuum
if your looking fora vacuum /rotary seal.. there is also the possibility of choosinga feroofluidic seal and or a magnetic driven feed . eliminating any machining
hi j stevens...the reason you have a high humidity on the larger chamber , is basically down to the sheer size of the chamber...with vacuum systems the larger the chamber the more condensation catalyst surface are you have...depend also what you are doing the process...as mgb says you could bake...
hi all, there area vast array of helium mass specs on the market these days..main players in these are alcatel varian leybold and pffeifer...they are all ballpark 10 k ish in price...the alcohol and pirani gauge is a good technique if yiou have little cash...itf your workingon large vac furnace...
hi redbelly...its justa generic link..theresan actual demo on utube of this exeperiment at this link http://www.youtube.com/watch?v=Ct4AqODwhI8&feature=related I am new here ...finding some stuff pretty interesting
quite an interesting topic.. the variables are of course heat viscosity and also volatility of the fluid, volume and level of vacuum...
it depends on the vaour pressure of the liquid being pumped within the vacuum..
ie a pot of water can be pumped toa level of 100 mbar beore it will boill and...
hi ryder..
the penning gauge and the size of the whole are directly linked for certain..ive worked with edwards and leybold gauges many years , no one has ever to my mid actually produced a document to corrulte any results..its the nature of the gauge I am afraid..ill put link to our gauges...
hi sound itself will not travel within the vacuum, the noise itself is purely down to the mechanics of the compont touching the edge of the container http://www.absolute-vacuum.com/resources.php
hi guys... if the vacuum isn't beyond 10-6 mbar ..ona coating system we have useda a product called duraclit ..its a cleaning compound primarily for silver it easily removes this metal deposists on windows.the only dowside is you need to liberally clean with alcohol or ipa afterwards..
the balloon in vacuum is actually a very old classroom demo to show the power of vacuum. assuming the balloon is flat and empty and in the belljar witha nominal vacuum applied within the jar the balloon will inflate.
hi i know what you mean, whilst i was with edwards vcauum when we used to un the vacuum pump and test the current drawn ,,oncea hard vacuum is reached say.005 mbar vacuum the level of current amps to hold this pressure is qyuite low in compairiosn to an industrial compressor..but its not really...
HI to measure vacuum in hg..that inches of mercury ..thats an old method using a mercury manometer. the simplest andswer is half atmosheric pressure 1000mbar divided by two.