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[SirBruce]

If I run magma and water side-by-side separated by a common constructed wall, will the water boil?  If so, how far apart do they need to be?

[Flaede]

I don't think boil. I do know that ice a floor above will melt.

[Sphalerite]

If I run magma and water side-by-side separated by a common constructed wall, will the water boil?  If so, how far apart do they need to be?

No, water only boils on direct contact with magma.

[Flaede]

While we're on the subject: water and magma combining create obsidian where htey meet, but what about two pumps pointing at the same tile, one pumping magma and one water. will that one tile become obsidian? or just water or magma.

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[SirBruce]

If I run magma and water side-by-side separated by a common constructed wall, will the water boil?  If so, how far apart do they need to be?

No, water only boils on direct contact with magma.

Awesome, thanks.

[moki]

While we're on the subject: water and magma combining create obsidian where htey meet, but what about two pumps pointing at the same tile, one pumping magma and one water. will that one tile become obsidian? or just water or magma.

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Obsidian, as always when water and magma touch. Why would it do something else when the to liquids are pumped? 

[Flaede]

because there is only one tile for them both to fit into, and thus they can't "meet" in the usual way.

[Executer]

They meet because the tile is filled with one substance, and the other is pumped into it.

[thijser]

But if you activate them with one switch in theory they should activate at the same moment (perhaps someone should just test it and make a video can't be that difficult end it might bring up and interesting behavior.)

[Flaede]

They meet because the tile is filled with one substance, and the other is pumped into it.

So they do meet? It's a lot of work to play with Magma in the new version, so I wanted to be sure about things before designating the 100 screw pumps.

[Executer]

I really don't see what the issue is.  When 1/7 or more magma and 1/7 or more water is in one square, it becomes obsidian.

[culwin]

Dwarf physics is defined only by dwarf experimentation.
Make it happen!

[AxisofLint]

I really don't see what the issue is.  When 1/7 or more magma and 1/7 or more water is in one square, it becomes obsidian.

I think his issue lies in the concept that if a tile has say, 7/7 water, how can it fit 1/7 magma in there too?

[Kanddak]

They meet because the tile is filled with one substance, and the other is pumped into it.

But if the tile is filled with one substance, the other fluid may never be pumped into it because the pump pathfinding can't find an appropriate tile to place it.
I just tried this and got magma in the tile every time. I suspect this is because of the order I built the pumps in, and the other way would put water there every time.

[Flaede]

They meet because the tile is filled with one substance, and the other is pumped into it.

But if the tile is filled with one substance, the other fluid may never be pumped into it because the pump pathfinding can't find an appropriate tile to place it.
I just tried this and got magma in the tile every time. I suspect this is because of the order I built the pumps in, and the other way would put water there every time.

Verdict: They don't meet.
Thank you for testing that. I have 100z levels down to the magma, I want those dig designations right the first time!