Fire Definition and 306 Threads

Thanks for the link! I feel really shocked that the electric drywell insulation specification (at least for Browns Ferry) does not exceed 436K for 15 min, and 411K long-term. If this is nuclear building code/nuclear electric code conform then these codes are extremely lax. I fear we have...

Dear All, I work in an engineering company here in Abu Dhabi, UAE. Very recently, we have been asked by our clients to perform STRESS ANALYSIS FOR THE FIRE FIGHTING PIPELINES. But my engineer initially said that for FIGHTING PIPELINES, stress analysis is not required as the water is...

I know that oxygen is necessary for fire to exist, but could there perhaps be another element that the combusting material could bond to? What is so special about oxygen? Couldn't the right conditions create a reaction similar to oxidation, but with a different element?

Homework Statement I am just wondering, if you fire something at some speed and acceleration, that something will come down even stronger right? So you know in funerals, often there accompanied some men in some suits and they start firing a few times in the air. Why do they do that even...

If paper ignites at 500 C, can one start a fire with a typical shaving mirror using sun light? Since the only time a concave mirror has an upright, virtual, magnified image is with the object between the mirror and focus, I estimate a focal length of about 1m. Now, the sun is at...

I've just finished some past exam papers and when marking them using the mark scheme something confused me a little One question said when a fire engine moves away from an observer, the pitch of the siren decreased, why and I chose the wavelength of the sound wave decreases The mark scheme...

I can think of two things. Stimulated Emission and Absorption. Would it be possible to do an experiment where you could control coniditions to allow just these two outomes? Thanks

Does anyone know a good resource that describes the physics of fire (not the album)? I understand the chemistry of it, breaking apart of hydrocarbons, and combining them with oxygen, but I have been trying to figure out what is actually happening on the atomic level. What is an "ignition...

I actually would like to know two things... How hot is the fire from burning vegetable oil straight up? (like in a bowl) and How hot is vegetable oil fire when a bowl of oil is on fire and then water is poured onto it? (big fire) I googled but only found flash point info and how to...

Hi, I'd like to know what makes a http://tinyurl.com/4dp9ocl" better at starting a fires by focusing the sun light. Is it the magnifying power, it's size, it's thickness (etc.) ? Also, is there a formula to calculate it ? Thank you. -Philippe

So is it? I had a long discussion about it in school and the internet gave very mixed answers. Because we are wondering if fire is ionised and this magnetic?

How? I've been looking but the only thing I get is the double slit experiment. How do you build a device that shoots one electron at a time? I know how to build a device that shoots a whole stream of electrons. But 1 at a time! How is it possible to get to such high granularity?

Hopefully I'm posting in the correct place. This book was written in the early 90's and I've just read it earlier this year. I also have a (very laymans) interest in neuroplasticity. I believed this was a very recent concept, but a bit of digging revealed the term was first coined in the 1970's...

I came into my engineering class this morning and our teacher showed us this strange material. He got the material from a student who recently went hiking. According to the student, he and his father went into the woods and started a fire in an old metal tire rim. They threw a bunch of old...

Penrose and Gurzadyan are not giving up without a fight. They posted a second paper today, answering their critics: http://arxiv.org/abs/1012.1486 More on the low variance circles in CMB sky V.G.Gurzadyan, R.Penrose 2 pages (Submitted on 7 Dec 2010) "Two groups [3,4] have confirmed the...

And if so, what state of matter is it?

Today when I was sitting at my desk in the lab, all of a sudden I saw fire in my PC! So I cut off the power in a hurry, and opened the case to check it. Then I turned on the power, and to everyone's surprise, it started up normally like nothing happened! At that moment I was totally ...

I wasn't sure where to post this, so hopefully I didn't post it in the wrong place and hopefully I won't get flamed. Anyway, I am a boyscout and last weekend I was doing a demonstration on fire by friction. I use a bow drill. For those of you who do not know, this is how it works: A spindle...

Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 35 m. The water leaves the hose at ground level in a circular stream 3.5 cm in diameter. What minimum power is required to create such a stream of water? Every cubic meter of...

Hello Physics Forums, I'm attempting a portable energy generator that will apply the Seebeck Effect to a campfire, allowing the camper to enjoy his new source of electricity. Right now I have a basic concept, basically a raised platform on which you stack the logs and then light them on...

I've been reading a section on induced dipoles in Griffiths, It says that although an atom as a whole is electrically neutral, there is a positively charged core and a negatively charged electron cloud, and when the atom is within an electric field the nucleus is pushed in the direction of the...

I'm trying to understand what fire is at an atomic level. I'd appreciate it if you guys could correct me where I am wrong and fill in any gaps. 1: When you heat an object it introduces energy. 2: This energy causes the atoms in the object to jiggle around. 3: At some point introducing the...

I,ve noticed that when I fire a rifle that my left ear feels the most damage were my right ear feels allmost no damage. How can that be when my right ear is closest to the rifle chamber? I am right-handed.

currently, I'm be studying on improving fire tube boiler's combustion efficiency. so, i need a software which is applicable to the title above in order to prove my calculation according to the formula. can u tell me what software can be used?

Does there exist a device that can be put in a fire or other hot heat source to generate energy? I'm looking more into if a portable or smaller device fits this category.

How do "automatic" fire hose nozzles work? I'm hoping someone can explain to me how "automatic" fire hose nozzles work. As in TFTs (Task Force Tips). I have a background in physics and since becoming a volunteer firefighter for my own interest have been working through some of the physics...

Homework Statement I'm trying to figure out what exactly this equation (the one inside the red box) means for this article. The whole article is the attached PDF. Homework Equations The Attempt at a Solution I've been looking at this article for 2 days now and I'm doing OK for the...

Earlier, I had posted that I thought that I had made liquid oxygen. People seemed skeptical that it would work, but I did an experiment to prove the concept. On a ring stand, I had some burning paper towel. I put some liquid nitrogen in a pie tin and allowed atmosphere to condense on the...

Homework Statement Assume that the speed of sound in the air is V=343m/s. Use the generalized form of the Doppler equation to solve the following problem. You are standing 100m away from a long straight road while a fire engine passes by along the road. The fire engine is equipped with a...

[b]1. Two towers A and B are 18.5 miles apart. The bearing from A to B is N65E. A fire is spotted by ranger at both towers. Its bearing from A and B are N28e and N16.5W. This makes a triangle with A and B and C the fire. Can anyone give me a clue and finding angles A and B?[b]2. a/sin A = b/sin...

I had an idea the other day and I wondered whether or not it was possible. I want to build a water tank hooked up to a hose that can fire with the force of a real fire hose ( I'd really be delighted if I only reached half that ). Here's what the numbers: A fire hose has roughly 8 bars of...

Hello, Chitose wonder chick again. First, This is NOT my homework. ........... I herd theory that we can quickly put out the fire by setting explosive right next to it. Suck away oxygen or something I'm not sure I wonder is this theory is true? If it's true how come? Is explosion...

Can a fire say in a dish plate with a pile camphor be visible from a couple of miles in the night? What would it take to put a fire visible from a few miles? Will a pile of camphor in 1mx1m do the trick? Been puzzled with this question for a while and thought the experts in this forum can help...

Is there a way that I could create a fire detecting thermometer that would detect a fire if the temperature went above a certain point? For example, if a thermometer went above 200 degrees C this would signal a fire? How would I create this?

Homework Statement Hearing the siren of an approaching fire truck, you pull over to the side of the road and stop. As the truck approaches, you hear a tone of 460 Hz; as the truck recedes, you hear a tone of 420 Hz. How much time will it take for the truck to get from your position to the fire...

I heard about a fire safety campaign called "hug a banana" (or similair) The idea was to encourage kids to run toward a large scary shape in yellow overalls and breathing apparatus if they come into your smoke filled bedroom - instead of running and hiding. Since US firefighters wear yellow...

Is it possible? As far as I know you'd need energy from a star nucleus greater than the suns to cause any change in the atmosphere, creating heavier gasses right? Could the amount of oxygen in the air going above 30% have any impact other than fires burning longer, or any human combustion...

Before I start, I want to make sure you all realize that I'm completely serious; this isn't a joke. So my mom is religious, and I'm not. Since I'm into science, she likes to try to provide all kinds of "scientific facts" to back up intelligent design, most of which is simply made up or draws...

OK, so paraffin is a hydrocarbon, and is a solid form of kerosene or mineral oil... I wanted to try making my own wax logs for starting our wood stove. Could I take dried out sawdust, mix it with a small amount of mineral oil, suck the moisture out of the "shape", allow for it to dry, then...

Hello. I'm new here and I've started a college level physics course at my college without having any sort of physics background. Nevertheless, I find it quite challenging and fun. I like to understand things from class by applying it to real life. I like to go camping and sometimes I make my...

Homework Statement A horizontal stream of water from a fire-fighter's hose hits a vertical wall. The firefighter knows that 16.9 kg of water are emitted from the hose per second, and that the water has a speed of 45.5 m/s. At the instant when it hits the wall, the direction of the velocity...

A gun fires a projectile toward a target that is 4.54 km distant at the same elevation as the gun. The gunnery officer notes that the projectile hit the target 27.5 s after firing. a)Find the angle of elevation of the gun barrel. b)Find the initial speed of the projectile. So x=4.54 km...

A fire hose must be able to shoot water to the top of a building 35.0 m tall when aimed straight up. Water enters this hose at a steady rate of 0.500 m3/s and shoots out of a round nozzle. i) What is the maximum diameter this nozzle can have? ii) If the only nozzle available has a diameter...

A fire helicopter carries a 625 kg empty water bucket at the end of a cable 18.3 m long. As the aircraft flies back from a fire at a constant speed of 35.4 m/s, the cable makes an angle of 36.3° with respect to the vertical. Calculate the force of air resistance on the bucket.

My roommates were using Tin Foil under the stove burner to prevent the base from getting messy. One instance when I was cooking soup, the contents spilled onto the base covered by the tin foil. The contents started to burn and I saw flames. Tin foil has a very high melting point. I can't...

Homework Statement A fire helicopter carries a 564 kg bucket of water at the end of a 19.2 m long cable. Flying back from a fire at a constant speed of 41.6 m/s, the cable makes an angle of 46.0° with respect to the vertical. Determine the force of air resistance on the bucket. Knowns: m...

I am hoping that someone on here can give me some insight on what caused this. I have my idea; however, I would like someone to give their opinion also. At work we have a 13000 volt motor that powers our compressor. How frequent can that size motor be started without causing the motor to...

The huge Station Fire near Los Angeles is on or approaching Mount Wilson: http://www.mtwilson.edu/fire.php The mountain is also the site of the main broadcast transmitters for all (or almost all) Los Angeles area TV and radio stations. Local stations have been warning that many people who...

Hi All, A friend and I were recently considering the idea of measuring water flow in a fire hose, buy measuring the flux generated by the water moving through the hose. Neither of us are scientific by any means, but I've been trying to research the idea and have not gotten very far. I...

Any of you fellow nerds in the armed forces? I am currently serving in the U.S. Navy as a Fire Controlman...currently a 2nd class petty officer (e-5). My job is HIGHLY technical, hence why I love the electronic and mechanical engineering forums here, since my job really involves both. My...