Is there any alternate to liquid nitrogen?

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In 2006, CANBERRA released two electric cryocoolers based on new (for germanium detector cooling) but proven technologies. They are the Cryo-Cycle™ Hybrid Cryostat and the Cryo-Pulse™ 5 Electrically Refrigerated Cryostat. Both of these cryo-coolers eliminate the need to continually maintain detector LN2 levels, are quiet and low maintenance, and use 325 watts or less of power. As a testament to their advanced technology and reliability, they are both offered with a 5-year, pro-rated parts and labor warranty. In 2007, CANBERRA extended the Cryo-Pulse 5 technology to a portable, battery-powered germanium spectroscopy system called the Falcon 5000® Portable HPGe-based Nuclear Identifier. It includes the detector, cryostat, digital signal processing electronics and multichannel analyzer – all in one unit – and can be operated wirelessly from a Tablet PC using the Genie™ 2000 suite of spectroscopy software. These three cryo-cooler products offer similar application flexibility to the various shapes and sizes of LN2-based Dewars/cryostats previously discussed. http://www.canberra.com/pdf/Literature/AppNote/C36758-LN2-AppNote.pdf Nov 03 09, 8:06 AM

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What's the difference between a liquid and a fluid (is there any)? Is there any drinkable liquid that can expand fire? What is the Nitrogen Cycle? Which is the only metal to burn in nitrogen? Why is there 78% nitrogen in the air, or where does this vast proporton of nitrogen come from?

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