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Good point, Guess it will vary by eruption / volcano Each eruption will be different and the composition of the lava (and pumice) will contain different minerals. That said most pumice will be ancient and anything soluble will already have been leached out. Most of my experience is...

Pumice - volcanic lava 'froth' I'm no vulcanoligist (no nothing to do with Startrek 0X) but IIRC the pumice is formed at the start of the eruption when the molten lava is under pressure and the gasses and steam expand inside the liquid rock and if it cools quickly enough they get trapped giving...

Fascinating thread - What about using pumice to lighten? Hi, Earlier in the thread there was talk of making things lighter - it reminded me of the pantheon - Roman engineers needed the concrete to be light so they used pumice as aggregate leading to a very light yet strong dome almost 1900 +...

Couple of thoughts;- pressure increases with depth - the calculation you choose will be based on the load at the bottom of the window - If you're willing to have a 1' deep concrete wall at the base plus a 4 x 12 window, there will be much less stress than a 5x12. Similarly if you can manage...

Fermentation also slowed by Alcohol Used to do a little home brewing. Once you build up the alcohol level to about 3 or 4% then the yeast starts to die (Thats why most beers are at that level). Same yeast used to make bread rise. Some stronger yeasts are available that will tolerate higher...

Hi, Looking for a little advice on the best way to wild capture lionfish. Out here in the Caribean :hat: they are an invasive species and need to be removed. Used to have freshwater setups for many years with good water quality. Figure a Marine fish only (Lionfish only) should be do-able...