We have all heard of the famous female scientist Marie Curie, so have you ever heard of the Curie effect named after Marie Curie?
If a coin is hung in mid-air with a wire and a magnet is prepared adjacent to it, it is conceivable that the coin will definitely attract with the magnet; if it does not attract, then the coin is mostly wasted.
However, when the coin is baked with a candle, the coin actually leaves the magnet, and even swings back and forth like a convulsion, like a little couple who have been beaten by a stick.
In fact, this phenomenon is the Curie effect, the coin contains platinum, gold, silver, nickel, copper, iron, aluminum, zinc and other metals, these metals belong to ferromagnetic substances, ferromagnetic materials will have a strong magnetic properties after reacting with magnets.
At this time, the magnetic domain magnetic moment inside the ferromagnetic material is in an orderly arrangement, but when it is heated by the candle, as the temperature increases, the ferromagnetic material will show paramagnetism.
This means that the magnetic domain magnetic moment inside the ferromagnetic material is disorderly, and the ferromagnetic material at this time has no magnetism, so it is no longer attracted to the magnet.
But when the coin leaves the range of the fire, the temperature will drop, and the magnetism will return, so the coin will be thrown into the arms of the magnet again, and then it will be roasted by the candle and lose its magnetism.
So the cycle repeats, there is also a scene of coin "sheep madness", and the temperature when the coin magnetically disappears also has a proper noun - Curie point temperature. This is why this phenomenon is called the Curie effect.
The word "Curie" is mainly derived from Marie Curie's husband, the famous physicist Pierre Curie.
At the end of the 19th century, Pierre Curie accidentally discovered this phenomenon while doing experiments in the laboratory, and later people named this phenomenon the Curie effect in his honor.
In life, the rice cooker we use also makes use of the characteristics of the Curie effect, and a magnet and a magnetic material with a Curie point of 103 ° C are installed in the bottom center of the rice cooker.
After we steam the rice, the water in the pot is boiled dry, at this time the temperature of the rice will continue to rise from 100 ° C, and when it reaches 103 ° C, the magnetism of the magnetic material will disappear, and at the same time it will be separated from the magnet, then the power switch will also be disconnected, stop heating, and a pot of fragrant rice will come out of the pot.