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How much heat a fireball produce?

Posted: Mon May 29, 2017 5:07 pm
by oleck
Well any ideas? Im trying to give some logic to a proyect. Does a fireball could melt a soapstone or it would just charge it with heat energy?

i found this information


Physical – Mechanical – Thermal – properties of soapstone
Specific heat capacity 785 J/Kg.°K
Thermal conductivity 12.5 W/m.°K
Melting point temperature > 2912°F = 1600°C (+)
Comprehensive strength 34 MPa (Megapascals)
Transverse strength 12.6 MPa (Megapascals
Permanent linear change
on Reheating to 1022°F = 550°C nearly none (n/a)
Modulus of rupture 13.2 MPa (Mega-pascals)
Apparent porosity
(this is NOT a softness) Non-porous
(or perhaps 99.9% non-porou

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 5:34 pm
by night_druid
According to Dragon Magazine #123, Fire for Effect!, a fireball has a temperature range of 1,250 to 1,950 C, or 2,280-3,540 F. Average temperature of about 1,600C.

As for your question, depending on how hot you make a fireball (probably cooler at the lower levels, higher at 10th or more), the effects depend on the size of the soapstone in question. A small soapstone idol? Probably at least soften it to the point of ruining its value, to causing it to melt completely. A soapstone wall? Probably won't damage it, but would soften the outermost layer, maybe causing a little deformation damage.

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 6:08 pm
by AuldDragon
Fireball does not produce heat of a specific temperature. It creates magical fire that can melt soft metals, ignite combustibles, and deal damage. If you try to decide exactly what the temperature is, you're likely to start ruling that things like saving throws no longer apply because science dictates certain things can't survive the temperature it appears to produce, but the spell is magic, not scientific.

Just let it deal the damage and apply saving throws to determine what is destroyed or damaged by the spell.

Jeff

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 8:00 pm
by Robin
Hot enough to burn your balls, cold enough to stop the instant after explosion, not leaving any heat (except igniting combustables).
Ice for example reflects heat before it starts to melt, and thus would only have a faint molten surface, candles however (wax parafine or other, would either be molten in an instant and then harden again, or ignite into flame as being combustable.
Water will also not boil, but a vessel on it could ignite as being combustable.
See it as elemental fire...it has more or less power/effect according the elemental bias table/diagram inn the Rules Cyclopedia page 264

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 8:04 pm
by rendclaw
Yeah, trying to apply too much logic into a fantasy RPG is going to do nothing but create frustration one of two ways.

For you, because you are going to spend loads of time trying to apply logic into a system that allows for the illogical.

For your players, because once you make all the change you want to make to the game, its not D&D anymore.

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 8:48 pm
by stebehil
For a semi-logical answer, I´d say that a fireball will not do more than superficial damage to walls and stones, as the time of exposure is minimal. It goes BANG! and is gone again. For fire to damage stone, you need it to burn for some time.

Re: How much heat a fireball produce?

Posted: Mon May 29, 2017 11:22 pm
by oleck
Ok well thx for the anwsers. I you help me a lot. Simply im trying to see how logical could it be to use a soapstone artifact in space to produce heat and the way i thought was to use a magic user to use fireballs on it. The soapstone conserve the heat for a period of time. But eather way i dont know how a fireball will react in space. The other was was to capture a red dragon and use his firebreath to do the job.

Re: How much heat a fireball produce?

Posted: Tue May 30, 2017 7:27 am
by Big Mac
This is more of a system question, than a Mystara question, and the answer may vary a bit depending on what ruleset you are using with Mystara.

We recently had a fireball in a 2nd Edition (Spelljammer) game that I am in and there was a lot of discussion about how it works afterwards.

Our GM told us that fireballs cause fire damage - not heat. So what you are basically looking at is someone causing fire damage to soapstone. The damage may cause the soapstone to catch fire - if it is flammable.

Perhaps building a pyre of wood, with soapstone sitting on top of it, and setting light to it with a fireball would be more what you need.

Re: How much heat a fireball produce?

Posted: Tue May 30, 2017 5:34 pm
by AuldDragon
Big Mac wrote:Our GM told us that fireballs cause fire damage - not heat. So what you are basically looking at is someone causing fire damage to soapstone. The damage may cause the soapstone to catch fire - if it is flammable.
I meant it doesn't create a specific temperature of heat. :)

Basically, roll an item saving throw. If it passes, the heat and fire cause no damage, for whatever logical reason makes sense for the situation. If it fails, it is damaged or destroyed for whatever logical reason makes sense for the situation.

Jeff