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[lordcooper]

I'm normally blessed with vast quantities of obsidian so I've never really bothered manufacturing my own.

So, how long does water take to cool the magma?

Would it be possible to do this in the air, thus burying enemies under obsidian that is still there (not a construction)?

[The Scout]

I'm normally blessed with vast quantities of obsidian so I've never really bothered manufacturing my own.

So, how long does water take to cool the magma?

Would it be possible to do this in the air, thus burying enemies under obsidian that is still there (not a construction)?

Water instantly turns magma to obsidian and no it's not possible in midair that I know of.

[Darkond2100]

It's instantaneous. And it only happens when it comes in contact with water. I think that you can designate a pit/pond so that your dwarfs will take water to your magma.

[jfs]

What you might be able to do is make a regular magma drowning chamber, make sure it's several Z-levels high, and also be able to drop water into it. So first trap someone in there. Then fill the chamber with a couple of levels of magma, say 3 levels. Then start dripping water into the middle of it. That should spawn some insta-collapsing obsidian blocks in the top layer of the magma pool.
Of course the magma itself will kill most enemies quickly enough, but for those that do survive the heat and lack of air, dropping some solid stone onto them might help.

[monkeyfetus]

There was a thread on here titled something like "Magma + Water + Mid-air = " that asked the same question.

[Dr. Hieronymous Alloy]

There was a thread on here titled something like "Magma + Water + Mid-air = " that asked the same question.

Obsidian won't form completely in midair -- you just get a drip castle, but will form (and instantly fall) if it's "connected"/adjacent to a bridge and nothing else.

[Lav]

You can make a bauxite bridge in mid-air and drop magma and water on it.

Magma drops on the bridge and splashes, water drops on magma and turns some of it into obsidian, bridge decomposes, a solid brick of obsidian crashes down.

Untested but should work.