PYROTECHNICS
Pyrotechnics special effects are widely used in motion picture production to create all types of effects involving explosions, fires, light, smoke and sound concussions. The types of pyrotechnics materials used include flash powder, flash paper, gun cotton, black powder (gunpowder), smokeless powder, detonator explosives, and many more. They are used in bullet hits (squibs), blank cartridges, flash pots, fuses, mortars, smoke pots, sparkle pots, etc.
The main problems of pyrotechnics include prematurely triggering the pyrotechnic effect, use of larger quantities or more dangerous materials than needed, causing a fire, lack of adequate fire extinguishing capabilities, and, of course, inadequately trained and experienced pyrotechnics operators. As a result of these risks, all pyrotechnics special effects are regulated at the federal, state and local level.
In general, all pyrotechnics are explosives, but not all explosives are pyrotechnics. Class A explosives (high explosives) are materials like dynamite and Primacord which may detonate even if unconfined. Pyrotechnic special effects materials are Class B explosives. They will burn, but not explode unless confined. Examples are black powder and pellet powder, safety fuses, igniters, igniter cord, fuse lighters, Class B special fireworks, and Class B composite solids propellants. Class C explosives are common fireworks. Note that short lengths of Primacord may be classified as Class C under certain conditions. Both Class B and C explosives are also called low explosives.
All pyrotechnic materials and other explosives consist of an oxidizer (source of oxygen) and a reducer (fuel). Examples of oxidizers include potassium nitrate, strontium nitrate, potassium perchlorate and potassium chlorate. Examples of fuels include metals like magnesium and aluminum, sulfur, silicon dioxide, and organic fuels like charcoal, starch, resins, and chlorinated hydrocarbons. The choice of fuel and oxidizer determines the type of effect (flash, smoke, sound, etc.) its color, and its intensity.
There are two basic types of pyrotechnic materials: single component and two component systems. Single component materials will either burn if ignited, or explode if ignited when enclosed, since the oxidizer and fuel are in the same mixture. Flash paper, for example, is a partially nitrated cellulose and contains both fuel and oxidizer internally. The traditional black powder has potassium nitrate as the oxidizer, and sulfur and charcoal as fuels.
In two component or binary systems, the oxidizer and fuel are separate components which are transported and stored separately and only mixed when ready to use.
Purpose: To identify the mystery powder based on its physical and chemical properties, comparing them to the five substances and which one matches. The chemical reactions with water, universal indicator, vinegar and Iodine solution are then analyzed and matched with each other to determine the mystery powder.
When the flame was blown out and the glowing wooden splint was placed halfway into the test tube containing H2O2 and MnO2 crystals, the splint reignited and caught flame once again. This demonstrates the decomposition of H2O2 into water and hydrogen. MnO2 is a catalyst that increases the rate at which H2O2 decomposes. Adding oxygen to a fire will cause it to burn faster and hotter and the oxygen rich test tube allowed the splint to reignite.
Glow sticks get their “glow” when two chemicals are mixed together because of a chemical reaction. The chemical reaction is called Chemiluminescence. A Typical glow stick has a plastic tube with a smaller inner tube inside. There are three components, two chemicals and a fluorescent dye which accepts the energy and helps covert to light. There is more than one way to make a glow stick, but the most common uses a solution of hydrogen peroxide and phenyl oxalate ester along with the fluorescent dye. The hydrogen peroxide is in its own compartment away from the other two components until ready to use. The fluorescent dye is what determines the subsequent color of the glow stick when the chemical solutions are combined.
Combustion is a rapid, continuous reaction that usually takes place in the gas phase. Wood is an organic compound primarily comprised of cellulose. For wood, the phase change from a solid to gas is almost instantaneous as combustion occurs (Coleman, et al. 95). Ignition occurs when an outside source is no longer needed to sustain combustion (Coleman, et al. 87).
Other igniters exist but are not recommended as highly as the charcoal grill sparker. The Colmen lantern spin lighter which use a flint and striker can become gummed up with some fuels and is not recommended for use in spud guns which will use hairspray as a primary fuel. This lighter must have new flints installed when they run out. This type of lighter also will fail to function when wet with fuel. The flame style barbecue lighter is a click lighter that produces a small-sustained flame. This lighter rarely misfires but is very hard to install given the high pressures it would be subjected to. Also the fuel in the lighter it self must be refilled. Some Spud Guns use a spark plug and battery setup that involves more work as well as more components. The benefits of this style of ignition system is that you have the ability to remote detonate the fuel from a safe distance. By far the push button charcoal grill sparker is the recommended igniter. It is cheap, effective, relatively easy to install and long lasting.
OH 27000 J/g. Hexane C H 35000 J/g. Variables:.. The variables used in this experiment are: Volume of water, mass of fuel, temperature of water, height of tube. height of flame, type of fuel, time it takes, width of flame, colour. of flame, material of container, size and surface area, purity of.
In conclusion, the Triangle Shirtwaist Fire was a tragedy that could have been avoided. It caused many innocent people to lose their lives. But, fortunately this caused the factory owners and the government to take more precautions with the factory.Because of this incident, the safety standards have changed significantly such as better firefighting equipment, and fire alarm. Now there are more exit doors which can only be used as an emergency and if you intend to go through that door, the fire alarm will turn
ignited. (High grade powder doesn’t even need a flame to ignite – it can be set off by
The burning of the materials is a complex process. Combustion of any material requires three components: heat, oxygen and combusting material or fuel. When heat is applied to the composites materials, temperature of the materials increases. At particular temperature, pyrolysis temperature, materials start to decompose, and produce
Since man’s first experiences with fire we have longed to control it and we wished to will it to do our bidding. For very long we failed mostly, and we still do sometimes, but with the trials and experiments we have done and died doing, we succeed now, mostly. The first formula that is still written down of an “explosive or pyrotechnic composition” are the three examples of gunpowder in the 1044A.D. Chinese military guide Wujing Zongyao which showed a few uses of this powder they had experimented with for near a hundred years. The most used formula from it was approximately 50% KNO3, also known as Saltpeter in those times, and formally called Potassium nitrate today, ~25% S, Sulfur, and ~25% carbonaceous matter (mostly charcoal and compounds mixed with impure sulfur); the other formulas move the percentages for the KNO3 around 10-15%, S 5-10%, and carbonaceous 7-20% to adjust burn rates and usefulness in certain situations. The likely only reason gunpowder was ever invented was the Chinese’s wish to live long, and their many mixtures of elixirs, which was what gunpowder was intended to be used as (more-pyrotechnics.com). “Within 200 years China had several crude weapons, mostly huge iron or alternative metal barrels and maybe a wooden grip but with no aiming attachment. They also had very many types of fireworks using no telling how many formulae for devices ranging in size, color, and purpose. People in Europe hear of this powder and its power, and then slowly find out more“(more-pyrotechnics.com). Then by 300 years they had better arsenals, larger cannons that actually worked well, and better, lighter barrels. The Indians and Islamic nations have made use of this by now, neither surpassing China’s previous ones nor Europe’s futu...
One type of engine is a called a fuel cell. A fuel cell operates like a battery. Unlike a battery, a fuel cell does not run down or require recharging. It will produce energy in the form of electricity and heat as long as fuel is supplied. A fuel cell consists of two electrodes sandwiched around and electrolyte. Oxygen passes over one electrode and hydrogen over the other, generating electricity, water and heat. Hydrogen fuel is used to make all this work. Fuel cell emissions are nothing but water vapor.
“(A) any destructive device as defined in section 921 of this title (i.e. explosive device);
...ceed the limitations of rockets using chemical energy (Mallove, 49). This type of rocket is used by heating the fuel with nuclear reactor to provide thrust another words a propellant mass (Tate, 2013).
Ammonium nitrate was a key ingredient in a bomb that killed hundreds of people. It is an odorless crystal salt that can be either white or grey. It is created by a combination of ammonia and nitric acid. (ammonium Nitrate fact sheet). The primary uses for this chemical are fertilizers and cold packs, as well as military explosives (Mathews J, 2014). Not only is it an oxidizer but under enough heat and pressure, it can explode (ammonium Nitrate fact sheet). This explosive property leads to it being labeled a hazardous chemical in toxicology reports. In the past it has been a part of terrorism attacks such as the Oklahoma City bombing and accidental explosions in fertilizer factories. The Oklahoma City bombing is known as
High exposure to flame retardants has been correlated with multiple adverse effects on the human body, including disruption of hormones produced by the thyroid gland, hindering of the immune, reproductive, and nervous system, cancer, and dangerous effects on fetal and child development. (SD, 2017)