Why The Flame Can Be Affected By Magnetic Field – Plasma in the Outer Flame.
We all know that matter has three common states: solid, liquid, and gas. However, in addition to these three states, there are also plasma states, liquid crystal states, and so on.
If we continue to heat the gas so that the temperature of the gas continues to rise, the molecules that make up the gas will move more and more violently and collide more and more frequently.
When the movement of a molecule is violent to a certain extent, it can no longer withstand such a violent movement and such frequent collisions, and it will disintegrate and separate into positively charged and negatively charged parts.
Since the molecule as a whole is electrically neutral, the total electric charge of all the separated negatively charged parts and all the positively charged parts is equal, so it is called “plasma” plasma.
Therefore, in simple terms, plasma is composed of many positively and negatively charged particles (including ions, protons, and electrons) that are constantly moving, and the moving charged particles will be deflected under the action of a magnetic field, which is The plasma is changed by the action of the magnetic field.
Plasma changes under the action of magnetic field
And there is a lot of plasma in the outer flame of the flame, so the flame will also be affected by the magnetic field.
Although we have figured out the reason why the shape of the flame changes under the magnetic field, why does the flame under the action of the magnetic field become short and thick? This has to mention the concept of Lorentz force.
The Lorentz force is the force experienced by moving charged particles in a magnetic field. Physicists have discovered that when a charged particle moves in a magnetic field, as long as it moves in a direction different from the magnetic field, it will receive a force from the magnetic field, which is the Lorentz force.
The strange thing is that the Lorentz force does not change the magnitude of the particle’s velocity, but changes the direction of the particle’s velocity. Without other constraints, charged particles would spiral through a magnetic field.
Charged particles constantly deflected by the Lorentz force
Judgment method of Lorentz force direction
Charged particles deflect under the action of a magnetic field precisely because they are subjected to the Lorentz force. The plasma in the flame happens to be made of constantly moving charged particles, satisfying the conditions of the Lorentz force.
We all know that the hot air has an upward trend, and although the movement of the high-temperature plasma in the flame has a certain randomness, it generally moves upward.
At this time, if magnets are placed on both sides of the flame, that is, a magnetic field is added near the flame, the positively and negatively charged particles in the plasma will be deflected to the two sides perpendicular to the magnetic field under the action of Lorentz force.
The main component of the outer flame of the flame is plasma. When the upwardly moving plasma is deflected to the two sides, the flame as a whole looks like being flattened from both sides, from the original thin and long to short and thick.
Of course, the above is only an explanation in the most ideal case, ignoring many details. The movement of plasma in the flame is very complicated. The strength of the magnetic field, the airflow between the two magnets, the temperature of the outer flame, the type of fuel, etc. will all affect the size of the flame.
Interested friends may wish to light a candle at home, find two magnets, and try to do this experiment by yourself under the premise of ensuring safety, to see how the shape of the flame changes. Children must be accompanied by their parents when doing this experiment!