Fire Definition and 300 Threads

Hello everybody: I am trying to test, using Bernoulli's Principle, when firehoses are most effective. I know this is extremely broad, but does anyone have any ideas for independent variables? I am thinking about the the width of the end piece of the nozzle... Any help/guidance would be...

http://imgur.com/a/FKkHL 1. Homework Statement A moose is running away at 25m/s. You fire an arrow at 30 degrees when it's 120m away. What must the velocity of the arrow be in order to hit it? Homework EquationsThe Attempt at a Solution Please see attached picture, I'd type it out but I'm...

Hello, This is for my independent game development project. I am aiming to simulate simple environmental properties in grid-based world. I have world made of cells (or blocks) and I consider each physical property to be constant and uniform in given cell. Some properties spread from a cell to...

The Windscale Fire seems like it had the potential to become a much more serious incident due to actions taken in trying to get the reactor under control. First the operators ran the air fans at high speed to try to cool the reactor, but that only made the fire even more intense. Then crews...

My CO2 extinguisher has a restriction placed at the point in the gas horn where the CO2 enters it. Why would anyone want to reduce the gas pressure here and speed the gas up when the pressure in the CO2 reservoir is pretty high to begin with and could generate a stream that moves fast enough...

I'm wondering whether it's possible to survive most fires by filling the bath with water and a balloon with air (it doesn't matter if it comes from human exhalation), then go underwater and breath through the balloon. When I was a kid I used to breath in a balloon that I would fill with air by...

People routinely live above 4000 m, where oxygen partial pressure is under 130 mbar. True, we often suffer mountain sickness there, and take days adapting to the height as we walk up. But airplanes are only pressurized to 760 mbar total, 160 mbar oxygen. And that drop, from 210 mbar to 160 mbar...

http://www.bbc.co.uk/news/uk-england-london-40272168

I'm trying to figure out the best approach of creating an electric fire starting stick that we plan to use for prescribed prairie burns in Iowa. The drip torches we currently use are fuel based, and we are trying to move away from this if possible. I need help determining how to configure a...

Homework Statement Dry saturated steam at a temperature of 180ºC is to be produced in a fire tube boiler from the cooling of 50 000 kg h–1 of flue gases from a pressurised combustion process. The gases enter the tubes of the boiler at 1600ºC and leave at 200ºC. The feed water is externally...

Hello, I'm currently doing research for my thesis about non halogen fire retardant composite. One of the main result is deviate and confusing because: There is no fire retardancy's effect of Magnesium Hydroxide addition to resin epoxy. Why?Any suggestions? Thanks

Hello. I entered my home to find that a light was on. I definitely did not leave the light on when I left. When I looked at the switch, it was burnt and there was smoke residue everywhere on the mirrors and a burnt smell in the room. I went to turn it on and there was a hot heat coming from the...

wanting to know if you could create a hydro system using an old firefighting pump discarding the old petrol or electric motor and replacing it with an generator or alternator. water would flow into the pump which would drive the generator

Here is the scenario. An astronaut is conducting experiments inside of a laboratory module within a space station when all of a sudden, a fire breaks out. The astronaut escapes from the laboratory module he was currently using and then proceeds to seal it off using an airlock. He then...

We kept getting some voltage spikes back into our amplifier. One of the things we put in place is a 10kOhm resistor (discharge load) connected to the output of the amplifier. However, the resistor keeps burning and setting on fire. The amp company offered a way on checking this... I'm really...

Very sad and preventable, IMO. Probably dozens of young artists killed by a fire at a party in their improvised workspace in a warehouse in Oakland. http://abc7news.com/news/families-search-for-loved-ones-after-deadly-oakland-fire/1638350/ Early reports are that the warehouse was converted...

I am curious as to the components of FDRs that allow them to sustain such g-forces and immense heat. Surely it's not just a steel box filled with paraffin wax. What alloys are used? what shapes are used in internal construction to prevent crushing/penetration? What do they insulate with and how...

Homework Statement A fire truck pumps a stream of water on a burning building at a rate K kg/s. The stream leaves the truck at an angle ##\theta## with respect to the horizontal and strikes the building horizontally at height h above the nozzle. What is the magnitude of the force on the truck...

Why does this happen? When the trash can is not moving, the air gets drawn in through the mesh and flows more or less straight to the fire. I'm thinking that a rotating trashcan "pushes" the wind in the direction that it's rotating, so that the wind no longer blows towards the fire, but...

I've read a bit about fire on wiki and I have some questions. 1. There is an exact ignition temperature for each material. Temperature reflects the amount of energy, heat. But also specific heat capacity of a each substance is different. So is the amount of heat, which is necessary for of...

I am wondering how many neurons would need to fire approximately in a human brain in order for the eye to blink, or for example, for a head to nod? And I am referring directly to just the motor act, not all the internal brain processes that might lead to an eye blink. And I am not necessarily...

So I'm not the best at typing English, so please bare with me. So I have a school project to a 6. Grade class, who was never heard of atoms or how anything reacts (maybe they have, but not much) so I don't know what to type, so that it's understandable and gets the information into them. I have...

I hope things get better today in Fort McMurray ("Fort Mac") Alberta, http://www.cbc.ca/news/canada/edmonton/wildfire-rages-in-fort-mcmurray-as-evacuees-settle-in-edmonton-1.3565573

I'm about to do some calculations for a sprinkler system in a parking garage (OH2). This system follows EN 12845 (design of automatic sprinkler systems), but I'm sure the procedure for what I'm about to ask is quite similar in NFPA as well. I need to determine the system's most unfavorable...

Is it possible to have a flame that's not hot to the touch? I'm not sure how fire/flames work but if they can burn underwater I don't see how they can't somehow be safe to the touch

I am reading the book "A History Of Optics" by Oliver Darrigol, and I came across this sentence (under the heading Visual Fire): Isn't this a low-quality argument? This can be directly disproved by the fact that humans inbabilty to see in dark, viz. if humans can see things from the "fire"...

I am doing a project that relates to welding acrylic. I got the bottle today, and I can't use it because its flammable and has chemicals known by the state of California to cause cancer (makes you wonder why the hell they would market this crap). Are there any clean, non-flammable, and...

Hello. I've learn that fire is chain-reaction process when burning materials are surrounded by oxygen with enough amount and they're heated exceeding some ignition point. That point is nothing but the temperature above which oxidation between material and oxygen begins. Then during...

is there a way to calculate the themperture of something like a fire, if you know the thermal energy it produces.

This happened a week ago, during a Halloween party on Friday the 30th of October. For recent developments, please see http://www.bbc.com/news/world-europe-34720074 http://www.bbc.com/news/world-europe-34720183 Meanwhile, a wiki page was established...

There is only 0.77% of oxygen in sun And only 0.29% of carbon The question is there is only small amount of o2 but how how sun is surrounded by fire with very less emissions of carbon ( referred to Wikipedia for amount of gas in sun)

Hello all, I am in need of some help. I work for a fire department who had a significant fire truck crash last summer. Because of this, my department has set about making a training program for our drivers. Lucky me, I am in charge of said program. So I need some help. Here is the story. Last...

Hello We just had the fire alarm go off at a building in school, so I briskly put my laptop to sleep and stood outside. It's about 85 F outside, and my computer has had some issues with getting hot. Now I took it out of sleep and the screen is torn. I tried turning off the computer and reboot...

Homework Statement [/B] When Danny was 13, he went deer hunting with his grandfather. He decided that he didn't like the "kick" of the gun, so he pressed himself against a tree before firing a 12-gauge (3.5kg) loaded with a deer slug (0.22kg). Evaluate this idea. It was a big mistake. It...

P { margin-bottom: 0.08in; } Hi,I am currently working on a project on “safety for transportation of crude oil”, I don't have technical background in chemical and material science that is why I need some expert opinions.1- is there and process, chemical or material that can be added to a oil...

Homework Statement In the spectrum of the blue part in a candle flame, there’s a violet emission at 432 nm due to excited CH* molecules (chemiluminescence). Why 432? Why not 400 or 500? There are emissions at 436, 475 and 520 nm too. Why these numbers? 2. The attempt at a solution Is it...

At first this sounds like a very popular and often asked/solved question but it has a twist - I need help with the twist please. 1. Homework Statement A cannon is at Point A in a 3d environment. There is a wall at Point B which sits between the cannon and a castle, at Point C. Write a...

I'm building an frame out of solid 5/8 inch thick aluminum square bars. this frame will be around a fire temps close to melting points but there will be insulation in make sure it won't melt. I was thinking about drilling holes in the free space of the aluminum to reduce it's weight and if you...

Well all answer this basic question by saying that water decreases the heat energy of fire, CO2 blocks O2 from reaching fire.But what about coke, higher molecular gases.

Can an electric arc(such as this one http://upload.wikimedia.org/wikipedia/commons/7/7a/Electric_arc.jpg ) cause a combustion or fire if a 91 percent alcohol solution is sprayed on it?Thanks

St. Elmo's fires produce light and therefore useful energy. https://en.wikipedia.org/wiki/St._Elmo%27s_fire#Cause What is the source of this energy? I mean from which to which form does it convert to?

Hi there, I've seen videos and simulations of fire in zero or microgravity, but I'm trying to get a mental picture of how fire would look / burn in LOW gravity. Say a space station that rotates in order to create a light gravitational hold equivalent to the moon or even Mars...if a fire was...

For a project in my 3rd year hydraulics course we have to design a water distribution network for a residential area using EPANET and optimizing it using GAWUP (GANEO). I have the entire network set up with all the peak flow demands set for each of the required nodes. Using GANEO I can easily...

Homework Statement A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 6.7-cm-diameter hose delivering 490L/min through a 0.80-cm-diameter nozzle? Homework Equations...

Suppose I have a cubic lattice of N^3 masses, M, each connected to six nearest neighbors with springs of constant k free to move but at rest. Now fire a single mass, m, with velocity v at surface of the lattice such that no rotation can be imparted to the cubic lattice. Let the fired mass bounce...

Hi guys I'm new here and need map some help. I have built a simple circuit with a cd4017 IC. The circuit works perfectly and has led connected to it. However I want to connect much larger load to it. A relay is the obvious answer but I'm not getting enough current from the IC to fire the relay...

I have heard that when charged particles are accelerated, they emit radiation. Combining this with the knowledge that atoms within a fire, are colliding at more then roughly the order of 1021 collisions per second. Is this why fire emits light? Is it the constant high acceleration from the...

When we supply energy (activation energy) to a flammable gas, like methane, it burns. A chemical reaction occurs in which atoms rearrange, bonds made and broken. And energy is released. In the form of heat and light. But what is fire, actually? This may be a stupid question, but is this some...

Yikes! Glad nobody was hurt. Cause is still under investigation: http://news.kron4.com/news/second-alarm-fire-reported-in-stanford-linear-accelerator/ .

Somehow I managed to miss an anniversary from my childhood: It was 45 years ago last Sunday that the Cuyahoga River caught fire in Cleveland, Ohio: I was in high school at the time. My family didn’t live in the Cleveland metro area, but close enough that we mostly watched Cleveland TV...