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[FallingWhale]

I'm confuzled, how does one think this was done, the tunnel would need to be half an inch to trap air, and more than 2 feet to damage the mountain.

[Zrk2]

Basically what I'm saying is that gasses wouild have density like liquids hace depth, only that density should be able to be increased very high if more is introduced into a confined space. Then when a way into open space is open the gas should exapnd out until its' pressure is equal to the surrounding air and it should do this at varying rates based on its' pressure and it should move objects.

[Mel_Vixen]

Well gas or steam pressure dont actually need a to calculate some "confined space". This stuff has to act like water just without gravity and surface tension thus a pressurised cloud of gas will expand. That said it might be a bit hard on the computational time but could work with Toadys waterphysics.

edit: The steams/vapors pressure excibits a force into all directions thus if ever new cave in code goes in it would be a wonderfull way to blow your fortress up.

[Andeerz]

http://en.wikipedia.org/wiki/Hushing

I think the Roman mining technique in question was called "hushing", and took advantage of soil erosion and not compression of air to make some sort of explosive condition.

[Mdort Goblinsmiter]

This might work as an alternate power source to the water wheel/windmill.   Input: Coke/charcoal/wood, output: power for X time.

[irmo]

Well gas or steam pressure dont actually need a to calculate some "confined space". This stuff has to act like water just without gravity and surface tension thus a pressurised cloud of gas will expand. That said it might be a bit hard on the computational time but could work with Toadys waterphysics.

The water physics cheat a lot by assuming an incompressible fluid, and if you do this for air (1) you're wrong and will fail your fluid mechanics exam and (2) nothing interesting will ever happen because the static pressure of air is nearly equal everywhere. To make air pressure matter, you need thermodynamics (how much waste heat does that room full of smelters produce, anyway?), dynamic pressure (whoa CPU), or some way to mechanically compress air in a sealed space.

It also helps that your entire map isn't covered with 50 z-levels of water, whereas it would be sitting under a huge column of air.

[Zrk2]

Ok, I'm not a physics major, I see what you mean to do it correctly. But that's not what this is about. We want the effect, not the cause. I think that could be done as I outlined.

[Silverionmox]

I'm not opposed to steam physics if it takes a megaproject to apply them. Building a steam power plant workshop with three bars of metal and a stone block is of course completely out of the question. But as has been said, CPU concerns trump its rather small application until we have more cycles to give (and given that PC power only keeps doubling by adding more cores, that could take a while).

[Zrk2]

Good point. Should DF be expanded to be multicore (In the words of Blizzard: It will be done soon...) it would make more sense to add it in then. But yes, I am opposed to "Steam Workshops." Although not necessarily a mega project to apply. Perhaps you could run a steel pipe through magma and then pump water through it and when steam blows out the end it could power a pile of windmills. It could get even more useful with the moving fortress parts which have been mentioned for way down the line in Fortress Mode.