In books it is given that flame is only produced when gaseous substance burn but when dry wood is burnt it also burn with flame.why.
120656
According to my knowledge, heat is nothing but the result of the vibrations of atoms and molecules. I guess this mean that in heating up a gas or liquid, we are increasing the rate at which the container of this gas or liquid vibrates, thereby imparting to the molecules a certain amount of energy.  How would this work in case of a burning log in the fireplace? Is it vibrating and thus heating up the molecules in the room? Or is it releasing highly energetic photons that do the required bombarding? What exactly is happening when we light a fire?
24097
With the wording of , it seems like you take the cast the spell action to make the flame appear.  You can then attack with it later - it does use the wording "ranged spell attack."  It never addresses what you can do with it otherwise, even though you are still holding a handful of flame.     What if a tavern brawler or a Monk punches with the hand holding the flame, or uses that hand to make a special melee attack (grapple or push?)      Would that be considered a spell attack, or an unarmed strike because the hand is passively holding the flame?  Could you use the flame as an improvised weapon?    Or would it be something else?  Note: I am making a character for a silly one shot. I am not planning on trying to pull this off for a serious campaign, but it is worth trying as a goofy concept. This side note probably won't affect any answers but I wanted to include it anyway.
103457
We were making up Haiku, and there was some disagreement about the number of syllables in "fire."  Now granted Haiku isn't technically about syllables (see ), so technically it was a meaningless discussion.    However, I still do not know how many syllables are in "fire."  I understand an  might be at play.
25162
I just saw a , where one of the characters says:     it must be cast back in the fire from whence it came!   This struck me as odd, since I expected them to say "whence it came"; but now I find that "from whence" seems to occur as well.  Does anybody know whether this is correct, or whether it has been correct at some point and subsequently fell into disgrace (or vice versa)?
118036
I know how to control fire/smoke particles but flames and smoke always appear to be drifting upwards (i.e. positive global Z-axis) regardless.  I'm actually trying to create a sun-like fireball, i.e. I want the flames to emit outwards in all directions from a sphere. My particles are already doing this but the flames emitted from those particles are still drifting upwards only.  Is this possible at all with the latest release of Blender (2.69 at the time of this writing)?
8253
When your body burns calories and you lose weight, obviously mass is leaving your body.  In what form does it leave?  In other words, what is the physical process by which the body loses weight when it burns its fuel?    Somebody said it leaves the body in the form of heat but I knew this is wrong, since heat is simply the internal kinetic energy of a lump of matter and doesn't have anything do with mass.  Obviously the chemical reactions going on in the body cause it to produce heat, but this alone won't reduce its mass.
64869
I had the idea of throwing oil flasks on enemies at level 1, then hitting them with a torch to deal a bunch of bonus fire damage.  PHB 152:     If the target takes any fire damage before the oil dries (after 1 minute), the target takes an additional 5 fire damage from the burning oil.   PHB 152:     If you make a melee attack with a burning torch and hit, it deals 1 fire damage.   A flat 6 fire damage is pretty potent at level 1, but does the oil remain or does it burn out in a flash when hit (since it has no damage over time) when hit?  If not there is potential for a dual torch wielding PC to throw down 12 fire damage per round, or for multiple PCs to deal 6 damage per torch per PC per round.
102337
I am rather confused about this. I know from Charles' law that under constant pressure, the volume of a gas is directly proportional to its absolute temperature i.e.  $$\frac{V_1}{T_1} = \frac{V_2}{T_2}$$  Thus accordingly, during compression, temperature of the gas would decrease. But in Lectures of physics ,vol 1 by Feynman, it is written:     Suppose that the piston moves inward, so that the atoms are slowly compressed into a smaller space. What happens when an atom hits the moving piston? Evidently it picks up speed from the collision. [...] So the atoms are "hotter" when they come away from the piston than they were before they struck it. Therefore all the atoms which are in the vessel will have picked up speed. This means that when we compress a gas slowly, the temperature of the gas increases.   (Constant pressure?) So, this is contrary to Charles' law. Why does this happen? Who is right? Or are they both correct? I am confused. Help.
41743
Does such a pair of substances exist, that in certain physical conditions (temperature, pressure)  when both are placed in the same conditions, one will be a liquid, the other - a gas, and the gas density will be higher than that of the liquid?  (let us exclude special states of matter - e.g. don't count superfluid as liquid, or plasma as gas.)
88658
What's the order of "best fuels"?  Example: Coal cooks less than lava and blaze rods, wood cooks less than coal, etc.  What's the order of fuels based on their 'cooking quantity'?
92447
My reading of the rules concerning  and  in 5e work it out to be something along the lines of "the caster picks a point in space, and when the spell goes off (or after some delay/trigger in the case of Delayed Blast Fireball) suddenly there's magical fire in a 20 ft. radius around that point."  Notwithstanding the pitfalls of questioning the physical properties of magical effects (personally I like systems where everything makes a reasonable amount of sense), I wonder about how this would interact with small, confined spaces. Supposed a Delayed Blast Fireball was placed in a very small metal case, which was subsequently welded/sealed shut. What would happen when the spell is triggered?  I can think of three reasonable options at first:   We've created a grenade (albeit an extremely unstable one). This requires that force/pressure was generated by the Fireball, which creates implications for other applications. The vessel contains the explosion, and since no force or heat was generated (only "magic fire"), the vessel is afterwards unharmed. The vessel isn't blown apart (no force), but depending on its makeup might melt from the focused heat of the Fireball, leading perhaps to partial leakage.   Which scenario would apply? Or would something completely different happen?
85168
Just like , the color of my stove's flames were affected by the humidifier as well.  Why does this happen? Is it a good thing or a bad thing ?
33265
I wanted to know that if FIRE is Matter or Energy. I know that both are inter-convertible. but that doesn't mean there is interconversion taking place just like nuclear fusion or fission. If it is matter, then its has to occupy space and have mass. I really doubt that fire has mass. If it is energy, then i don't get it. Please enlighten me from my ignorance.
85981
Assume that by some mysterious(at the lack of a better word) way I was able to make a bonfire on the moon and was able to sit next to it without a space suit.  I will not be able to feel the heat form the fire as a result of convection as there is no atmosphere   Now my question is will I be able to feel the heat from the fire as a result of radiation? As far as I know a wood fire does not produce electromagnetic waves or does it?  In short what is thermal radiation?
31770
In a common wood fire such as a campfire, is matter converted to energy or is it simply an exothermic chemical reaction and all the mass can be accounted for in the ash and soot?
60033
There is an Ideal Gas Law, but why isn't there one for liquids or solids? Is it because they are much too hard to predict or that solids and liquids vary drastically in their reaction to temperature and pressure then do gases, thereby nullifying the need for a Law that could apply to all?
123014
On extended bicycle trips I sometimes slept under a plastic sheet, which helped with mosquitoes on hot nights. But there was a noticeable build-up of ammonia which made this almost impossible for more than an hour or so at a time.   Air is mostly nitrogen $(N_2)$ and there is always water (containing hydrogen) on a humid day. But I wonder about the mechanism for the formation of ammonia under these circumstances? There are (according to Wiki) trace amounts of methane and $H_2$ in the air. But methane and hydrogen (g) are I think pretty stable.   I wonder if the presence of exhaled air (containing $CO_2)$ could be a factor?  Thanks for any ideas.