Ben Carter
The question of whether a candle flame is plasma is a complex one. A candle flame is not a plasma because it does not have enough energy to completely break apart atoms. However, some sources argue that a flame behaves as a weakly ionized plasma, and that it contains a small amount of plasma. A flame is mostly a hot gas that glows due to chemical reactions, and the visible part of the flame is made up of tiny particles, often carbon, that have so much energy that they emit light. Plasma is an ionized gas, and a flame does contain some ions, as demonstrated by the fact that a candle flame will be pulled towards the negatively charged side of an active capacitor.
| Characteristics | Values |
|---|---|
| Definition of Plasma | A plasma is an ionized gas |
| Definition of Ionized Gas | An ionized gas means that some electrons have been completely removed from the atoms that make up the gas. |
| Ionized Gas vs Plasma | Every gas contains a few ions and free electrons, but not every gas is a plasma. |
| Criteria for Plasma | There must be a sufficient number of ions in the gas for it to be considered plasma. |
| Flame as Plasma | Flames can contain a small amount of plasma, but they typically do not have enough energy to break apart atoms completely. |
| Candle Flame as Plasma | Candle flames are not considered plasma because they do not reach a high enough temperature. |
| Flame Ionization | During combustion, there is a significant amount of energy and electron movement, which can lead to the production of ions. |
| Magnetic Field Effect | Placing a candle flame in a strong magnetic field can cause it to bend or extinguish. |
| Electric Field Effect | Applying a strong electric field can alter the shape, temperature, and light emission of a flame. |
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What You'll Learn
- Flames are plasmas with very low ionization rates
- Candle flames are not plasmas because they don't have enough energy to break apart atoms
- Flames can contain a little plasma, like sparks or blue flames
- A flame's shape is affected by an external strong electric field
- A flame can be extinguished by placing it in a strong magnetic field
Flames are plasmas with very low ionization rates
The question of whether a candle flame is plasma is more complicated than it might initially seem. A flame is made up of tiny particles, most often carbon, that have so much energy that they start giving off photons/light.
A flame is technically a plasma, but it has a very low ionization rate (much less than 1%). Plasma is an ionized gas, meaning that some electrons have been completely removed from the atoms that make up the gas. The effectively free electrons are negatively charged, and the resulting ionized atoms are positively charged. An "ion" is an atom with an unequal number of electrons and protons.
However, not all gases with ions are plasmas. There must be a cutoff point where there are enough ions in the gas that it begins to act like a plasma. The strictest definition of a plasma is an ionized gas with enough ionization that the Debye length is significantly smaller than the width of the gas cloud. The Debye length refers to the distance that an external electric field can reach into a cloud of charged particles.
Everyday flames, such as those from burning wood, charcoal, gasoline, propane, or natural gas, are typically not hot enough to be plasmas. However, certain burning mixtures of acetylene can reach temperatures of 3,100 degrees Celsius, which is high enough to be considered a plasma.
Therefore, while a candle flame may contain some plasma, it is mostly a hot gas that glows due to chemical reactions. The visible part of the flame is made up of tiny particles that have enough energy to emit light, but these particles do not turn into gas at normal candle-burning temperatures.
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Candle flames are not plasmas because they don't have enough energy to break apart atoms
While some sources argue that flames are technically plasmas, the majority of sources claim that candle flames are not plasmas because they don't have enough energy to break apart atoms.
Plasma is ionized gas, meaning some electrons have been ripped off the atoms that make up the gas. These effectively free electrons are negatively charged, and the resulting ionized atoms are positively charged. An "ion" is an atom with an unequal number of electrons and protons. While every gas contains a few ions and free electrons, not every gas is a plasma. There must be a cutoff point where there are enough ions in the gas that it begins to act like a plasma.
The combustion process of a candle flame produces energy and moving electrons between different reactants. Different substeps of this process produce ions in small quantities. However, candle flames do not have enough energy to completely break apart atoms, which is necessary for plasma formation.
During combustion, a candle flame actively emits light through an oxidation reaction. This light emission is due to the presence of tiny particles, most often carbon, that have enough energy to emit photons/light. These particles do not turn into gas at typical candle-burning temperatures, and the colour of the flame depends on the amount of energy released from these particles. Therefore, while candle flames produce light and heat, they do not have the necessary energy to break apart atoms and form a plasma.
While candle flames may contain some charged particles and exhibit behaviour influenced by external electric fields, they do not meet the strict definition of plasma, which requires a sufficient number of free electrons and ions to act collectively. The presence of some charged particles in a flame does not automatically qualify it as a plasma. Therefore, candle flames are not plasmas because they lack the energy required to break apart atoms and achieve the necessary level of ionization.
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Flames can contain a little plasma, like sparks or blue flames
While a typical flame is not a plasma, it can contain a little plasma, especially in sparks or blue flames.
A flame is mostly a hot gas that glows due to chemical reactions. It does not have enough energy to completely break apart atoms. However, during the combustion process, there is a significant amount of energy and moving electrons between the different reactants, and some ions are produced in small quantities.
A flame can be considered a plasma when there are enough ions in the gas that it begins to act like a plasma. This is characterized by the Debye length, which is the distance an external electric field can reach into a cloud of charged particles. The more atoms that are ionized, the stronger the collective oscillations of the charges and the smaller the Debye length.
In certain cases, flames can have a high enough temperature to cause the ionization of air atoms, resulting in the formation of a small amount of plasma. For example, when a candle is placed in an active capacitor, the flame is attracted to the negatively charged side due to the positive ions in the flame. Additionally, when a strong electric field is applied to a flame, its shape, temperature, and light emission can be altered.
Therefore, while a typical candle flame is not entirely composed of plasma, it can contain small amounts of plasma, particularly in the presence of sparks or blue flames, which indicate a higher temperature and increased ionization of air atoms.
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A flame's shape is affected by an external strong electric field
A flame, such as that of a candle, is a complex entity, with an inner and outer region. The outer flame is susceptible to external factors like airflow and electromagnetic fields, which cause it to move intensely.
The motion of charged ions produced within the flame is influenced by a high-voltage electric field. This results in an ion-driven wind that can alter the flame's shape, soot, stability, and heat transfer. The electric field can also affect the oxidation reaction within the flame, which is slower in the inner region due to insufficient oxygen.
Research by Purdue University demonstrates that electric fields can be used to manipulate a flame's shape and heat release. By creating anchor points, the flame's shape and internal volume can be altered, allowing control over heat release and the suppression of thermoacoustic instabilities.
Additionally, when a strong AC electric field is applied horizontally, the flame adopts a flat shape, and the width of the inner flame expands with an increase in AC voltage. When the AC electric field is applied vertically, the frequency of self-excited oscillation is influenced by the applied frequency. Thus, a flame's shape is indeed affected by a strong external electric field.
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A flame can be extinguished by placing it in a strong magnetic field
A candle flame is technically a plasma, albeit with a very low ionization rate (much less than 1%). It is a hot gas that glows due to chemical reactions, and the visible parts of the flame are usually tiny particles of carbon that have so much energy that they emit light. However, during the combustion process, there is a significant amount of energy and electrons moving between different reactants, and this can produce small quantities of ions.
The presence of ions in a flame means that it can conduct electricity, and it is responsive to magnetic fields. The introduction of a magnetic field will induce an electric current in the flame, which opposes the magnet's field and pushes it away. This results in the flame bending or being repelled.
The effect of a magnetic field on a flame depends on the strength of the magnet and the temperature. A strong magnet can attract oxygen and control the direction in which the fire burns. This creates a "wall of oxygen" that presses back against the flame and other gases, acting as a barrier that blocks airflow and can eventually extinguish the flame.
Experiments have demonstrated that it is possible to extinguish a candle flame using a strong magnetic field. One such experiment involved burning a candle between the magnetic poles, exposing it to the field, and observing that the flame was quenched within a few seconds. This phenomenon has been termed the “magnetic curtain" effect.
Therefore, it is indeed possible to extinguish a flame by placing it in a strong magnetic field, and this has been verified through experiments and explanations of the underlying scientific principles.
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Frequently asked questions
A candle flame is not a plasma because it does not have enough energy to break apart atoms completely. It is mostly hot gas that glows because of chemical reactions. However, a flame can sometimes contain a small amount of plasma, as seen in sparks or blue flames.
Plasma is ionized gas, where a sufficiently large number of ions exist to cause significant interactions. A stricter definition of plasma is a gas where there are enough freed electrons and ions to act collectively.
A flame can be observed to have plasma when you see sparks or blue flames. Additionally, placing a candle in an active capacitor will cause the flame to be pulled to the negatively charged side due to the positive ions in the flame.
