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Participant

Join Date: Apr 2009
Posts: 1

lighter liquid

04/03/2009 9:44 PM

seeking list of liquids/chemicals that are lighter than water - but biodegradable/safe in domestic use

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Guru

Join Date: Oct 2008
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#1

Re: lighter liquid

04/03/2009 11:17 PM

Google: specific gravity of liquids

Then do some research on biodegradability of liquids.

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Guru

Join Date: Mar 2007
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#2
In reply to #1

Re: lighter liquid

04/04/2009 9:44 AM

Any of the edible oils

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Power-User

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#3
In reply to #2

Re: lighter liquid

04/05/2009 1:26 AM

Anything edible will also be biodegradable. Like ethanol.

The Merck Index provides information on the physical properties and toxicity of a large number of substances. Your local public (or University) library probably has a printed copy in their reference section. It is also available online

http://library.dialog.com/bluesheets/html/bl0304.html

but it's not free.

The CRC Handbook includes tables of the physical properties of a great many chemical compounds, and the company also publishes a considerable number of more specialized books. Take a look at their website. http://www.crcpress.com/

There doesn't seem to be a single source of the information you're looking for. After you've done the grunt work, you might think of publishing your results to make it easier for the next researcher.

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Commentator

Join Date: Apr 2006
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#4

Re: lighter liquid

04/05/2009 10:09 AM

Can you say, vegatable oils?

bobguz

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#5

Re: lighter liquid

04/06/2009 2:51 AM

Safety is subjective on the basis of the method of use, the exposure and the training of the individual.

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Popular Science - Weaponology - Cardio-7

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#6

Re: lighter liquid

04/06/2009 10:10 AM

It depends a lot on your meaning of "safe in domestic use". Vegetable oils are pretty lousy solvents for most substances. I'd start with something like dimethylacetamide, density 0.937, bp = 164-166 C, and see if this meets your definition of "safety". History: A polymer applications plant in the US used a lot of polymers dissolved in DMAc. Near-by was a noted beer brewery. Since DMAc is miscible in all proportions with water, polymers can be readily coagulated from DMAc solutions. The DMAc then can be (in some circumstances) discharged with the water runoff, or recovered. The local brewery loved the runoff, as their brewing "bugs" thrived on the DMAc in the water! One never knows how truth is stranger than fiction.

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