#Let's have some dry goods##Old friends forum##Headlines tell the truth##Winter check-in season##看见人间百态#
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In ancient times, land transportation was limited by terrain and road conditions
Sailing became the primary way for people to explore the outside world and conduct trade.
During the Middle Ages, European seafaring began to take off
Figures of this period include Christopher Columbus and da Gama, who pioneered new routes from Europe to the Americas and Asia
With the gradual increase in routes, the navigation technology tends to mature. Maritime trade is also becoming more and more prosperous.
The endless horizon no longer had more than the fear of the unknown.
The other side of the ocean is depicted everywhere in gold.
The unknown and the huge interests are intertwined, so that some young people choose to become seafarers
As people begin to move away from what they know well, storms, diseases, and unknown stories become more and more mysterious.
When the ship was about to encounter a storm, people saw a pale blue flame on the ship's mast during a violent thunderstorm, like a tongue of fire, thus forming the fire of St. Elmo, which was considered magical by seafarers.
Legend has it that St. Elmo was the patron saint of ships, and when the ship was about to encounter a storm, he would release flames to protect the ship.
At the level of scientific development at that time, such mysterious, unexplained phenomena would be considered manifestations of supernatural powers
The principle of this pale blue flame has been basically understood with the progress of science and technology, and when there is a thunderstorm in the clouds in the sky, a strong electric field and electric current will be generated.
These currents will look for the path with least resistance in the air, just as water will look for the shortest path.
When these currents form a "loop" in the air, they generate large amounts of heat and light, forming ball lightning.
It usually occurs during a thunderstorm and is also known as a rolling mine.
It is a ball-shaped lightning bolt that is usually 15~40 cm in diameter and lasts for a few seconds, but it has also been observed to last for 1~2 minutes.
Ball lightning is very bright, mostly orange and red in color, but also has yellow, purple, blue, bright white and dark green aura.
It's like when you warm up with a bath bomb in the bathroom, it emits warm light and heat.
This is because the current in the bath bomb generates heat when it passes through the resistance wire.
Ball lightning is like a "bath bomb" in the sky, releasing a lot of heat and light.
And this kind of ball lightning is found in addition to ships at sea
In 1638, while a service was being held at St. Pancras's Church in England, a large fireball with a diameter of about 2.4 meters broke through the wall
The destruction of the church's window panes, tables and chairs, which was filled with strong black smoke and the smell of smoky sulphur, killed four parishioners on the spot and wounded about 60 others.
As for ball lightning, although we already have some understanding of it, more research and investigation are needed to reveal its full mysteries.