In what state can a fuel achieve combustion?

Liquid fuels Therefore, a liquid will normally catch fire only above a certain temperature: its flash point. The flash point of a liquid fuel is the lowest temperature at which it can form an ignitable mix with air. It is the minimum temperature at which there is enough evaporated fuel in the air to start combustion.

What is the minimum temperature needed to spontaneously ignite fuel called?

The flashpoint of a liquid is the lowest temperature at which the liquid gives off enough vapour to be ignited (start burning) at the surface of the liquid. Sometimes more than one flashpoint is reported for a chemical.

Which is a natural heat producing process that may give rise to a fire?

Chapter 15,16,17,18&19

Question Answer
A natural heat-producing process that may give rise to a fire is: spontaneous combustion
The decomposition of organic matter by heat describes: pyrolysis
Hydrocarbon acelerants can be detected by: portable dector(sniifer)/traied dogs

What is the concentration at which a vapour to fuel mixture in the air is capable of burning?

This means that gasoline can be ignited when it is in the air at levels between 1.4 and 7.6 percent. A concentration of gasoline vapour in air below 1.4 percent is too lean to burn. Gasoline vapour levels above 7.6 percent are too rich to burn.

What is fuel combustion?

Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke. … Combustion is often a complicated sequence of elementary radical reactions.

Which gas helps in combustion?

oxygen Air or oxygen which helps in burning is called supporter of combustion and the chemical reaction which takes place with the release of heat and light energy is called combustion.

How does spontaneous combustion happen?

Spontaneous combustion or spontaneous ignition is a type of combustion which occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self heating which rapidly accelerates to high temperatures) and finally, autoignition.

What does combustion refer to?

Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.

What is meant by spontaneous combustion?

spontaneous combustion, the outbreak of fire without application of heat from an external source. Spontaneous combustion may occur when combustible matter, such as hay or coal, is stored in bulk.

What is the process of combustion?

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. … When a hydrogen-carbon-based fuel (like gasoline) burns, the exhaust includes water (hydrogen + oxygen) and carbon dioxide (carbon + oxygen).

What is formed in any combustion reaction?

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. … The products of the combustion of hydrocarbons are carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.

What are three important things needed for combustion to occur?

Oxygen, heat, and fuel are frequently referred to as the fire triangle. Add in the fourth element, the chemical reaction, and you actually have a fire tetrahedron. The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

What is the range of concentrations of fuel vapor and air within which combustion can occur?

The range of concentrations of fuel vapor and air within which combustion can occur is the: self-sustaining range.

What is the process of heating a solid fuel so that it liberates gaseous fuel vapors?

A gas with a vapor density of ____ will rise in air. … What is the process of heating a solid fuel so that it liberates gaseous fuel vapors? Pyrolysis. In which process is a new compound created from the combination of oxygen and another substance?

Is gasoline combustible or flammable?

Gasoline is termed Flammable because of its Low Flashpoint and High Vapor Density. Kerosene and Diesel Fuel are termed Combustible because their Flashpoint is greater than 100 degrees F. Gasoline produces ignitable vapors that are 3 to 4 times heavier than air and can travel for great distances along the ground.

Why is fuel needed for combustion?

There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

How does fuel combustion work?

In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.

What is combustion of organic fuel?

Combustion is the process of burning an organic compound in oxygen to produce energy, carbon dioxide, and water vapor. … The relative amounts of carbon, hydrogen, and oxygen in the starting compound can be determined from the masses of the products of the combustion reaction.

Which of the following is mixed with fuel in the burner prior to combustion?

Primary air is mixed with the gas before ignition and secondary air is drawn in after ignition.

What is combustion class8?

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substances which undergo combustion are known as combustible substances. It may also be called a fuel. Sometimes, heat is accompanied by light, either as a flame or as a glow, during combustion.

Can petrol spontaneously combust?

It’s oxidation that creates the potential for spontaneous combustion. Petroleum products like motor oil and gasoline, while flammable, do not undergo oxidation. … If the liquid can spontaneously combust, so can the absorbent that contains it.

How many combustion are there?

There are 5 different types of combustion.

Which of these is not required for combustion?

Carbon dioxide (CO2) is not required for combustion. Rather, it is used as a fire extinguisher. Since carbon dioxide is heavier than oxygen, it covers the fire like a blanket and cuts off the contact between the fuel and oxygen, thereby dousing the fire.

What are combustion products?

Examples of combustion by-products include: particulate matter, carbon monoxide, nitrogen dioxide, carbon dioxide, sulphur dioxide, water vapor and hydrocarbons.

What do you mean by fuel Name some common fuels?

Fuel meaning: Meaning of fuel is a substance that is burned to provide nuclear energy, heat or power. Materials like coal, wood, oil, or gas can provide heat when burned. Methanol, Gasoline, Diesel, Propane, Natural gas, Hydrogen are types of fuel. Nuclear energy is produced by burning plutonium.

What are the 3 types of combustion?

The three important types of combustion are:

What is complete combustion?

Complete combustion happens when there is a good supply of air. Carbon and hydrogen atoms in the hydrocarbon fuel react with oxygen in an exothermic reaction: carbon dioxide and water are produced. energy is given out.

What is spontaneous combustion example?

Spontaneous combustion: The ignition of a substance or body from the rapid oxidation of its own constituents without heat from any external source is known as spontaneous combustion. Example: … In coal mines, fire breaks out many a times because of combustion of coal dust.

Is combustion an explosion?

The transition from combustion to explosion is caused by an acceleration of the reaction, induced either by a rise in temperature or by increasing lengths of the reaction chain. The first is called thermal explosion, and the second is called chain explosion.