The principle of capillary phenomenon is utilized. When a small glass tube is inserted into water, the water rises in the tube to a certain height before it stops; but when a small glass tube is inserted into mercury, the mercury falls in the tube to a certain height; this is capillarity at the interface of the solid, liquid and gas phases.

"Christmas tree" will flower, is because when the paper tree immersed in a chemical solution of potassium dihydrogen phosphate, the water solution in the paper tree in the rapid infiltration of the paper tree, up to the whole paper tree; paper tree branches at the end of the water solution first evaporated, there will be white crystals, which is to open the "snowflakes! This is the "snowflake". Because the color pigment applied on the paper tree beforehand is absorbed by the crystals, the Christmas tree is transformed into a colorful "flower".

Expanded Information

History

Once upon a time, Yarsas, Germany (now generally translated as Alsace, part of France), was the place where Christmas trees were produced. According to legend, a reclusive saint named Florentin, who lived in the middle of a wood in Alsace, was very fond of children. One Christmas, he wanted all the children in the neighborhood to play happily together, but he was very poor and had no money to buy the toys and candies that the children loved, so he was very upset about this.

One morning, while walking in the woods, Florentin suddenly saw a small fir tree, piled high with snow, with many small ice bars hanging from its branches, which, when exposed to the sun, glittered and shone very beautifully. So he brought the tree back and planted it in a pot. And he picked up some wild fruits in the wood, and mixed them with flour, and made little cakes in the shape of crosses, or stars, and hung them on the branches of the tree.

And he put some small candles on the branches of the tree, and made the tree very colorful and beautiful. On Christmas night, Florentine rang the bell, and when the children heard it, they all ran to his hut, where they gathered around the tree and sang Christmas songs with their hands in the air, and then Florentine gave the cakes to the children to eat, so that everyone had a happy Christmas. Later, the custom was passed down.

In 1837, Princess Helen of Germany, married to a French duke, the Christmas tree also spread with her to? The Christmas tree spread with her to [3]? Paris. In 1841, Victoria's husband, put a Christmas tree, placed in front of Windsor Palace. The custom spread from the royal to the aristocracy, and then to the people. In 1830, a large number of German immigrants came to the United States.

These people were Catholic friends and Christians, mostly scattered throughout New York and New England. Their Christmas trees attracted the attention and imitation of the locals, and then they became popular in American churches and families. Around the world, especially in Europe, America and Australia, Christmas trees have become the most lively and lovely decorations in Christmas, embellishing the colorfulness of Christmas and symbolizing happiness and hope.

The decoration of the Christmas tree seems to be similar all over the world. Since Christmas is in winter, Christmas trees are made of evergreens. Most are small palm trees or pines, four or five feet tall, planted in large pots and covered with colorful candles or lights, and hung with a variety of decorations and ribbons, as well as children's toys and gifts from family members.

After it is decorated, place it in a corner of the living room. For churches, auditoriums, or public **** places, the Christmas tree is taller, and presents can be placed underneath the tree.

According to Christmas customs, the first Christmas tree was a small palm tree by the side of the road in the city of Bethlehem (modern-day Bethlehem, Israel). On the first night of Jesus' birth, the Virgin Mary and St. Joseph were very tired when they walked to Balaam. The Virgin rested under the tree, and the little palm tree, as if favored, spread out its branches to protect the Virgin from the cold wind.

It was in the middle of that night that Jesus Christ was born. At that moment, a particularly bright star appeared in the sky, emitting a marvelous light that shot directly over the head of that little palm tree and hovered in a beautiful circle of light. From then on, the little palm tree took a place of honor in Christmas. It was only in the nineteenth century that Christmas trees became popular all over the world.

In the Middle Ages, a popular religious play in Germany, in a scene in the Garden of Eden, after God created man, Adam and Eve betrayed God, the play used a palm tree full of apples, representing the tree of life or the tree of knowledge of good and evil. Later the faithful moved the tree of life in the play to their homes to symbolize the coming of the Savior. As this symbol developed, decorating the Christmas tree, by the fifteenth century, became a custom.