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 07-25-2006 02:40 AM Momotaro CO2 bottle pressure in relation to room temperatures In response to a question about the internal pressure in a CO2 bottle at a given room temperature, one of our members, MADMAN280 posted this useful information: Quote: Originally Posted by madman280 When a CO2 tank is reasonably full it will contain a mixture of both CO2 liquid and vapor. As long as both liquid and vapor are present, the pressure in the (CO2) tank will depend only on the (ambient) room temperature (not "fullness") as shown in the table below: Tank Temperature Cylinder Pressure (F) (PSIA) @69° 837 @71° 859 @75° 905 @77° 928 @79° 952 @81° 976 @89° 1080 The gauge pressure (PSIG) is approximately 14.7 psi less than the values in the table above. The temperature to pressure relationship is logarithmic. Thats why its not a good idea to leave a full cylinder in your trunk on a hot day. Thanks MADMAN280!! Mike 12-01-2005 09:11 PM krazykidd86 Comprehensive DIY C02 Index - Recipes, reactors, & more Here's a collection of DIY CO2 articles that include directions for making various reactors, yeast recipes, and CO2 bottles units. DIY CO2 References - Understanding the Basics of DIY CO2 diffusion with how to guides Comprehensive DIY CO2 Report - reasons for CO2, DIY bottles, yeast recipes, and diffusors w/pics DIY CO2 Article - illustrates how to make DIY CO2 bottles, and yeast recipes w/pics CO2 Reactors and Diffusors - methods of dissolving and dispersing CO2 Hagen Nutrafin Ladder - one of the best CO2 diffusors CO2 Diffusion - using the "bell", filter and powerhead intakes, external reactors, glass diffusors External Reactors - are hooked inline to a canister filter to dissolve CO2 bubbles against water flow Aquamedic 1000 - Commercial External Reactor Gomer Reactor - DIY version of Aquamedic 1000 External reactor Rex Reactor - DIY version of Aquamedic 1000 External reactor Hoftiezer Reactor - external reactor using clear PVC from usplastic.com Inline CO2 Reactor - DIY version External Reactor CO2 Yeast Recipes Hagen Nutrafin Recipes - yeast recipe to fill Hagen canister unit Nyberg's Yeast Method - addition of soy powder to enhance CO2 production Jello Recipe - use of jello to prolong CO2 production

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