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Topic: Liquid nitrogen


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In the News (Wed 24 Apr 19)

  
  Nitrogen - Wikipedia, the free encyclopedia
Nitrogen is the chemical element in the periodic table that has the symbol N and atomic number 7.
It condenses at 77 K and freezes at 63 K. Liquid nitrogen is a common cryogen.
Nitrogen is the largest single component of the Earth's atmosphere (78.084% by volume, 75.5% by weight) and is acquired for industrial purposes by the fractional distillation of liquid air or by mechanical means of gaseous air (i.e.
en.wikipedia.org /wiki/Liquid_nitrogen   (1287 words)

  
 Nitrogen -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-09)
Liquid nitrogen is produced by (The process of purifying a liquid by boiling it and condensing its vapors) distillation from (Air in a liquid state) liquid air.
Nitrogen gas was inert enough that (French chemist known as the father of modern chemistry; discovered oxygen and disproved the theory of phlogiston (1743-1794)) Antoine Lavoisier referred to it as azote, which stands for without life.
Nitrogen is the largest single component of the Earth's (The envelope of gases surrounding any celestial body) atmosphere (78.084% by volume, 75.5% by weight) and is acquired for industrial purposes by the fractional (The process of purifying a liquid by boiling it and condensing its vapors) distillation of liquid air.
www.absoluteastronomy.com /encyclopedia/n/ni/nitrogen.htm   (2447 words)

  
 DermSmart:LIQUID NITROGEN   (Site not responding. Last check: 2007-10-09)
Liquid nitrogen, also known as LN2, is frequently used in our clinic to treat precancerous and cancerous skin lesions.
Nitrogen is the greatest component of the natural air that we breathe.
This nitrogen is compressed into a liquid whose temperature is 196§ C (or 321§) F. When a skin lesion is frozen with liquid nitrogen, the skin is superficially damaged.
www.dermsmart.com /encyclopedia/liquidni.htm   (88 words)

  
 Chemistry Film Studio
Various materials are immersed in liquid nitrogen to demonstrate the effects of low temperature on their physical properties.
Liquid oxygen is made and its colour, magnetism and ability to support combustion are shown.
Liquid nitrogen is boiled and the gas used to inflate a balloon and shown the volume increase.
neon.chem.ox.ac.uk /vrchemistry/FilmStudio/liquidnitrogen/page01.htm   (178 words)

  
 Liquid Nitrogen
Liquid nitrogen therapy is done by spraying this cold liquid onto the skin from a spray gun.
Liquid nitrogen is used to freeze and destroy skin growths, such as warts, keratoses and precancers.
Liquid nitrogen causes a stinging and burning pain while the growth is being frozen and this burning continues while it thaws.
www.skinsite.com /info_liquid_nitrogen.htm   (269 words)

  
 Features Item : How to Dose Liquid Nitrogen Effectively   (Site not responding. Last check: 2007-10-09)
Nitrogen consumption can be reduced by as much as 80% using a liquid nitrogen dosing system instead of gaseous nitrogen tunnels.
The challenge for the liquid nitrogen dosing equipment manufacturer is to control the boiling liquid and deliver the 0.001411 oz consistently at speeds from 40 bottles/min to more than 1,000 bottles/min.
The liquid nitrogen dosing is consistent; however, in accordance with basic gas laws, the final bottle pressure on the 18 fl oz fill is 17 psig and the bottle with a 18.3 fl oz fill has 25.5 psig final pressure.
www.process-cooling.com /CDA/ArticleInformation/coverstory/BNPCoverStoryItem/0,3668,7508,00.html   (1759 words)

  
 Interesting Products: FAQ
Liquid Nitrogen dewars are usually classified as "low pressure" (with a 22 psig relief valve) and "high pressure" (usually with a 250 psig relief valve).
Nitrogen Burst techniques create effects by using the intense cold of liquid nitrogen and the humidity that is present in the air.
Nitrogen Burst effects are created directly at the fog nozzle where liquid nitrogen combines with air, vaporizes and the nitrogen’s intense cold drives the resulting gaseous mixture below dew point.
www.interesting-products.com /faq.html   (2805 words)

  
 Liquid Nitrogen
Liquid nitrogen is inert, colorless, odorless, non-corrosive, nonflammable, and extremely cold.
Nitrogen is inert except when heated to very high temperatures where it combines with some of the more active metals, such as lithium and magnesium, to form nitrides.
To prevent cryogenic liquids or cold gas from being trapped in piping between valves, the piping should be equipped with pressure relief devices.
www-safety.deas.harvard.edu /services/nitrogen.html   (738 words)

  
 Shrinking balloon in liquid nitrogen
Applying the ideal gas law to the gas above the liquid nitrogen in a vacuum flask suggests that the volume of a balloon placed in it would reduce to one-fourth its volume.
It is interesting to observe the amount of liquid present inside the balloon once it has been in contact with the liquid nitrogen.
Since Pascal's law dictates that the pressure is the same at all points inside the balloon, then we know that when we put one end in the liquid nitrogen and it starts to shrink while the end in our hand still appears normal, then the internal pressure at that point has not changed significantly.
hyperphysics.phy-astr.gsu.edu /hbase/thermo/balloon.html   (586 words)

  
 PowerLabs' Unwise Liquid Nitrogen Experiments Page!
Having a regular Liquid Nitrogen supplier that delivers the liquid on my doorstep the same day I order it for a mere $4,5 per refill (2litres), I am very often found experimenting with it.
With Liquid Nitrogen it becomes possible to reach a ceiling of over 30000PSI (theoretical), which means that the potential for propulsion is spectacular.
The process is very simple: First, a small amount of Liquid Nitrogen is poured inside the hollow aluminium bat.
www.powerlabs.org /lnprop.htm   (877 words)

  
 Liquid Nitrogen
LIQUID NITROGEN is the neutral stuff which 80% of the air is made of, but cooled down to minus 196 degrees Celsius.
Because liquid nitrogen is so very cold, things that are normally soft are changed in surprising and amusing ways.
However, the liquid nitrogen is not a poison or a chemical as such and will completely disappear into thin air.
www.zyra.org.uk /liqnitro.htm   (1944 words)

  
 www.themodfathers.jolt.co.uk - Online Gaming - Clan Server Rental - The Modfathers.com
Liquid nitrogen evaporates off very quickly into the air so you cannot expect to make a suitable liquid nitrogen cooling system unless you are anything shy of independently wealthy or crazy or both.
Upon researching, we found that liquid nitrogen is always in a constant state of evaporation with the ambient room temperatures.
The problem with pouring the liquid nitrogen was the fact that when the super cold liquid nitrogen hit the room temperature metals of the block it boiled and splashed violently.
www.themodfathers.jolt.co.uk /?page=&action=show&id=7759   (4609 words)

  
 Containing Liquid Nitrogen   (Site not responding. Last check: 2007-10-09)
Other than expensive dewars, which can keep the liquid nitrogen for a long time, you can also keep it in just a plain styrofoam cooler of some kind.
This will work pretty well, but since the quality of the insulation is not quite as good, the liquid wont last as long (it will probably be "boiling" away the whole time it's in the cooler).
However, most anything that you would want to do with liquid nitrogen can also be done with dry ice, which is much easier to get and a lot cheaper to store.
van.hep.uiuc.edu /van/qa/section/States_of_Matter_and_Energy/Really_Really_Really_Cold/981741182.htm   (311 words)

  
 Liquid Nitrogen Safety
However, if sufficient liquid nitrogen is vaporized into a poorly ventilated space so as to reduce the oxygen percentage to below 20%, the people in that space are close to real bad trouble from oxygen deprivation.
Tube explosions are thought to be caused by liquid nitrogen entering the tube through minute cracks and then expanding rapidly as the tube thaws.
Large mobile Dewars or liquid nitrogen refrigerators (or the trolleys carrying these) used for transporting cryogens within a building or between building should be equipped with a braking mechanism.
www.omrf.org /OMRF/Safety/SafetyInfo/LiquidNitrogenSafety.asp   (599 words)

  
 Liquid Nitrogen Safety
Many substances become brittle upon contact with liquid nitrogen and may shatter when cold (such as common glass and large solid plastics), sending pieces of the material flying.
On vaporization it expands by a factor of 700; one liter of liquid nitrogen becomes 24.6 cubic feet of nitrogen gas.
Nitrogen is colorless and odorless – the cloud that forms when you pour liquid nitrogen is condensed water vapor from the air, not nitrogen gas.
www.cst.cmich.edu /safety/liquid_nitrogen_safety.htm   (599 words)

  
 Liquid Nitrogen Safety   (Site not responding. Last check: 2007-10-09)
When transporting the liquid in a car, however, it is probably a good idea to open a window.
Nitrogen can spatter into the eyes, and potentially blinding pieces of frozen things can fly around when we drop it.
Remember to stress the importance of not touching liquid nitrogen or frozen objects.
webs.wichita.edu /facsme/nitro/safe.htm   (361 words)

  
 LIQUID NITROGEN STORAGE
The portion remaining on the sieve is discarded and the portion on the paper is mixed with root fragments and placed in cryovials (12-16 per accession).
The vials are placed in numbered positions in a case which is inserted into trays that are suspended in liquid nitrogen.
Undisturbed, tanks containing liquid nitrogen require about 4 liters of liquid nitrogen per week to remain full.
invam.caf.wvu.edu /methods/storage/liquidN.htm   (518 words)

  
 Demo Lab: Fun With Liquid Nitrogen
Liquid nitrogen is readily available because it is prepared by liquifying air at 3,000 psi and then separating the nitrogen, oxygen and other important gases by fractional distillation.
Because air is so abundant, liquid nitrogen costs only 20 to 25 cents per liter (not counting the expensive equipment you need to store it).
Liquid nitrogen is a tremendously useful cryogen (low temperature refrigerant) in the laboratory.
www.ilpi.com /genchem/demo/liquidnitrogen   (1128 words)

  
 Liquid Nitrogen – Safety Guidance for Oncology Staff
   Contact with liquid nitrogen will cause embrittlement of exposed areas, due to the high water content of the human body – the eyes are particularly vulnerable.
There is a background evaporation of nitrogen from the tanks, this is of course much higher during the warmer weather.
Areas housing storage vessels and vivostats must be considered as confined spaces because of the hazard of large volumes of liquid nitrogen.
www.onc.ed.ac.uk /liquidnitrogen.htm   (744 words)

  
 Liquid Nitrogen2   (Site not responding. Last check: 2007-10-09)
This is a head for the liquid nitrogen cooling which I used.
This is an injection entrance of liquid nitrogen.
Liquid nitrogen is poured by using the tray of the styrene.
www16.big.or.jp /~bunnywk/ln2/ln2_e.html   (174 words)

  
 Liquid Nitrogen liquid nitrogen   (Site not responding. Last check: 2007-10-09)
When you are after excellent information about liquid nitrogen, it will be tricky sorting out the best information from ill-advised liquid nitrogen submissions or guidance so it is important to know how to moderate the information you are offered.
A great tip to follow when offered help or advice about a liquid nitrogen web page is to research who is behind the website.
Doing this could reveal the owners liquid nitrogen qualifications The quickest way to work out who owns the liquid nitrogen website is to look on the 'about' page or 'contact' page.
www.liquid-nitrogen-online.info   (221 words)

  
 SPI Liquid Nitrogen Dewars & Supplies
The safe handling and use of liquid nitrogen in liquid nitrogen dewars or flasks is possible only by knowing the potential hazards and using common-sense procedures based on that knowledge.
Because argon is an inert gas whose physical properties are very similar to those of nitrogen, the precautions and safe practices for the handling and use of liquid argon are the same as those for liquid nitrogen.
Materials stored in a liquid nitrogen dewar with a wide mouth are protected by the extremely low temperature of the liquid nitrogen or the gas that issues from the evaporating liquid nitrogen.
www.2spi.com /catalog/instruments/nitrodew-supp.html   (1843 words)

  
 Liquid Nitrogen Dewars - SPI Supplies
When using liquid nitrogen, be sure to use the highest quality cryo-gloves that can be found anywhere.
While liquid nitrogen is often times belittled in terms of its real hazards, no mistake should be made about it, one can sustain very serious injuries if not handled properly.
A liquid nitrogen refrigerator is a device more for storing refrigerated samples than a transfer dewar.
www.2spi.com /catalog/instruments/liquid-nitrogen-dewars.html   (1054 words)

  
 Liquid Nitrogen Material Safety Data Sheet (MSDS)   (Site not responding. Last check: 2007-10-09)
Liquid nitrogen is a colorless, odorless, extremely cold liquid and gas under pressure.
To prevent cryogenic liquids or cold gas from being trapped in piping between valves the piping shall be equipped with pressure relief devices.
Nitrogen is not listed as a marine pollutant by DOT 49 CFR.
www.medicine.uiowa.edu /biochemstores/Pages/ln2msds.htm   (1298 words)

  
 HANDLING LIQUID NITROGEN   (Site not responding. Last check: 2007-10-09)
Liquid nitrogen is manufactured by cooling down air to a temperature of 77 K.Liquid nitrogen is very common and easy to obtain, if you know where to look.
Liquid nitrogen can be obtained from these sources for a minimal cost.
Dewar bottles are hollow-walled glass-lined containers which provide excellent insulation.Dewar bottles will keep liquid nitrogen for a fairly long period of time.
www.ornl.gov /info/reports/m/ornlm3063r1/pt9.html   (299 words)

  
 Liquid Nitrogen Fun!
As liquid nitrogen is exposed to the air, it warms up and we can see its transition from a liquid to a gas.
Liquid nitrogen is made from cooling and pressurizing nitrogen gas.
Explore the properties of liquid nitrogen by conducting more experiments and researching to learn about pressure versus temperature relationships, liquid to gas transitions, and insulating properties of gas.
reachoutmichigan.org /funexperiments/agesubject/lessons/nitrogen.html   (672 words)

  
 Liquid Nitrogen Level Controllers
The Dual Sensor Liquid Nitrogen Level Controller automatically controls the liquid nitrogen level between two sensors, a high and low sensor.
After the liquid nitrogen rises above the upper sensor the solenoid is deactivated, stopping the LN2 fill cycle.
When the liquid nitrogen comes in contact with the sensor, the solenoid will close and the timer will restart.
www.jccontrols.net /ln2/ln2cat.html   (793 words)

  
 Liquid Nitrogen Safety
However, if sufficient liquid nitrogen is vaporized so as to reduce the oxygen percentage to below 19.5%, you are at risk of oxygen deprivation.
Nitrogen is to be dispensed only into smaller Dewars which either (a) have carrying handles or (b) are on wheels or (c) are 500 mL or smaller, and which have pressure relief valves or pressure venting lids.
(I.e., do not allow the liquid nitrogen to fall through a distance to reach the receiving vessel.) If the vessel is too large for the table, or the table is missing or inoperable, other provisions must be made for safely raising the vessel up to the delivery tube.
www.chem.purdue.edu /chemsafety/Chem/ln2.htm   (1233 words)

  
 Liquid Nitrogen   (Site not responding. Last check: 2007-10-09)
Nitrogen is the major constituent of the air we breathe.
Liquid nitrogen can cause serious damage to skin and eyes if it is improperly handled.
If you spill liquid nitrogen on your clothes, you will probably be 'burned'.
www.williams.edu /Physics/kforkey/liquid_nitrogen.htm   (367 words)

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