Can combustion take place in the absence of air or oxygen and why?

Never, combustion cant occur without Oxygen. For instance, if you burn a candle and place a clear transparent glass upside down on the candle after few seconds you would observe that the candle doesn’t burning.

Can you have combustion without oxygen?

Incomplete combustion will occur when there is not enough oxygen to allow the fuel to react completely to produce carbon dioxide and water. It also happens when the combustion is quenched by a heat sink, such as a solid surface or flame trap.

Does all combustion take place with air?

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.

Is pyrolysis a combustion?

Both combustion and pyrolysis are thermochemical reactions. But, there are differences between combustion and pyrolysis. The key difference between combustion and pyrolysis is that combustion occurs in the presence of oxygen whereas pyrolysis occurs in the absence (or near absence) of oxygen.

Does combustion make oxygen?

During the combustion process, as the fuel and oxidizer are turned into exhaust products, heat is generated. To summarize, for combustion to occur three things must be present: a fuel to be burned, a source of oxygen, and a source of heat. As a result of combustion, exhausts are created and heat is released.

How does combustion take place?

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).

Why is oxygen needed in combustion?

Oxygen. Oxygen supports the chemical processes that occur during fire. When fuel burns, it reacts with oxygen from the surrounding air, releasing heat and generating combustion products (gases, smoke, embers, etc.). This process is known as oxidation.

Can pyrolysis occur without oxygen?

Pyrolysis, which is also the first step in gasification and combustion, occurs in the absence or near absence of oxygen, and it is thus distinct from combustion (burning), which can take place only if sufficient oxygen is present. The rate of pyrolysis increases with temperature.

Why is pyrolysis done in the absence of oxygen?

Pyrolysis is the heating of an organic material, such as biomass, in the absence of oxygen. Because no oxygen is present combustion does not occur, rather the biomass thermally decomposes into combustible gases and bio-char.

How combustion takes place in space?

Without gravity, hot air expands but doesn’t move upward. The flame persists because of the diffusion of oxygen, with random oxygen molecules drifting into the fire. Absent the upward flow of hot air, fires in microgravity are dome-shaped or spherical—and sluggish, thanks to meager oxygen flow.

How can fire burn in space?

Fire is a different beast in space than it is on the ground. When flames burn on Earth, heated gases rise from the fire, drawing oxygen in and pushing combustion products out. In microgravity, hot gases don’t rise. Space flames can also burn at a lower temperature and with less oxygen than fires on Earth.

Can a combustion reaction take place without oxygen?

As we already know, a combustion reaction cannot proceed in the absence of oxygen. For burning or combustion to take place, oxygen should be essentially present because it is the only gas that supports burning. A combustion reaction will always occur when a substance reacts with oxygen to release energy.

What is combustion and how does it work?

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer.

What is the composition of oxygen during combustion?

Oxygen-Enriched Combustion When a fuel is burned, oxygen in the combustion air chemically combines with the hydrogen and carbon in the fuel to form water and carbon dioxide, releasing heat in the process. Air is made up of 21\% oxygen, 78\% nitrogen, and 1\% other gases. During air–fuel combustion, the chemically inert nitrogen in the air dilutes

What are the three conditions needed for combustion to occur?

1 There must be Fuel to burn. 2 There must be Air to supply oxygen. 3 There must be Heat (ignition temperature) to start and continue the combustion process.