Trees that are denser than water. Including a detailed introduction of its characteristics.

rosewood and rosewood have high density. Red sandalwood is denser than water. Tielimu: It is the hardest tree I have ever seen. It is as heavy as a water rock. Unlike other trees, it is used to make some durable furniture and is famous for its hardness. The information provided by Tiemu's Botanical Education Science Network. Electronic Magazine, No.9, 22, on September 1, 22 is as follows: You probably didn't expect that there would be a tree harder than steel, did you? This kind of tree is called Betula platyphylla. The bullet hit this kind of wood, just like hitting a thick steel plate, and it did not move. This precious tree has a height of about 2 meters, a trunk diameter of about 7 centimeters and a life span of about 3-35 years. The bark is dark red or close to black with white spots on it. The leaves are oval. Its production area is not wide, mainly distributed in the south of Korea and the border area between Korea and China, and there are also some along the southern coast of the Soviet Union. The wood of Betula platyphylla is hard, three times harder than oak and twice as hard as ordinary steel. It is the hardest wood in the world, and people use it as a substitute for metal. The Soviet Union used to make rolling balls and bearings from birch trees and used them on speedboats. Betula platyphylla also has some wonderful characteristics. Because of its extremely dense texture, it sinks as soon as it is put into the water. Even if it is soaked in water for a long time, its interior can still be kept dry. There is only one plant left of the Ruishi Tiemu, also known as Tianmu Tiemu, which grows in the west Tianmu Mountain of Zhejiang Province. This national treasure belongs to betulaceae, belonging to Tiemu. There are four members in this family of Tiemu. They are all small deciduous trees, distributed in the west, middle and north of China. Fortunately, the only remaining ironwood tree produced a few fruits in 1981, and scientists have used it for seedling raising and cutting propagation. Iron wood is hard and can be used to make furniture and building materials. The information provided by the mail order department of the post office in Longzhou County, Guangxi Province is as follows: Longzhou Tiemu chopping board is made of rare subtropical wood Tiemu, which is hard, compact, tough, corrosion-resistant and moth-free, and has the reputation of "king of wood". The cutting board made of it is not easy to deform, and there is no sawdust when cutting vegetables and meat, so it is durable. Temujin should be the former, betulaceae, four members of Temujin. As for the four members, it remains to be investigated. Longzhou Tiemu chopping board is definitely not "twice as hard as ordinary steel, and it is the hardest wood in the world", otherwise it must be matched with a kitchen knife made of depleted uranium alloy (hardness is 2.5 times that of steel), hahaha! What kind of subtropical wood is used to make Longzhou Tiemu chopping board, which needs to be investigated. However, there is a lattice wood (Erythrophloeum fordii) in subtropical wood, which is as hard as iron, so it is also called Tiemu. It is an evergreen tree of Hematoxyliaceae and a national first-class precious tree species. From Guangzhou, I drove along the highway from Liuxihe Irrigation District Villa to Da 'ao Village in Shengang Town. After crossing a stream, I saw a straight lattice tree on the edge of the village, with lofty tree posture and vigorous branches. The glossy pinnate compound leaves cover the ground of 46 square meters, the height of the tree is about 33 meters, and the bust is 5.12 meters. According to the villagers, this tree is 4 years old. In the past, it was called Da 'aoling, which was a virgin forest. Later, villagers split mountains and built villages here, and many big trees were cut down. Around the village, 1 lattice trees with a DBH of more than 5 cm were left as "Feng Shui trees", which made this lattice tree survive to this day. In Jinggang village, about four kilometers away from Daao village, there is also a piece of Tiemu forest with more than 3 trees, with a height of 13 to 2 meters and a DBH of .2 to .8 meters. Some trees can still grow tenaciously after being struck by lightning. There is an ancient temple nearby, named Youyuantang. The wooden pillars and the gourd-shaped short roof of the building are all made of iron wood, and the wood is well preserved without decay. According to the villagers, this ancient temple is 12 years old. The material of ironwood is very hard, and nails are hard to nail in. Its heartwood is reddish brown or dark brown, and it becomes dark brown and shiny after a long time. Sapwood is yellowish brown; Wood has staggered texture, fine and uniform structure, no shrinkage after drying, no deformation, water resistance and corrosion resistance, and is a good material for architecture and furniture. The "Zhenwuge" in Rong County, Guangxi and the "Sipailou" temple in Hepu County are all made of iron wood. Zhenwuge is a three-story building built in the early Wanli period of the Ming Dynasty. It is 13.2 meters high and 13.8 meters wide, with golden ridges and green tiles. It is solemn and magnificent, and there is no nail or rivet. Over the past 4 years, it has remained very strong after many earthquakes and storms. The "Four Pailou" was built in the Northern Song Dynasty. After thousands of years, the wood was shiny and not damaged at all. Knock on the iron wood used as the beam, and it will clank like iron. The seeds of Tiemu are like persimmon seeds, but they are black and shiny, and they are very hard. If they are not treated, they will not germinate completely after three years of sowing. It is necessary to cut off the leather corners with a knife or soak the seeds in boiling water to dissolve the leather layer, so that the seeds can easily absorb water and germinate. South American ant wood (pretending to be red sandalwood, also known as South American red sandalwood, Brazilian red sandalwood and gold ivory) is a big tree with a height of 27M and a diameter of .4M；; The stem shape is not very good, and the taper is large, and the height under the branch is about 12-15 m; The board root is 3-4M high. Distributed in Mexico, Brazil, Colombia, Bolivia, Peru, Paraguay, Venezuela, Guyana and Suriname. It can grow in a variety of ecological environments, from ridges and hillsides to the banks of rivers and low mountain rainforests, and often forms pure forests with small communities. Wood porous material. The heartwood is light or dark olive brown, often with light or dark stripes, which is slightly obvious with sapwood area. The sapwood is grayish yellow or grayish brown, with a width of 3-9CM and a slightly obvious growth. The air-dried density is .81-1.2g/cm. The drying characteristics of the wood are as follows: easy drying, fast or medium speed, slight cracking, warping and surface hardening, and good results can be obtained by kiln drying. Leguminosae (pretending to be rosewood, also known as Caragana, safflower pear, Thailand, and Caragana) is mainly produced in Southeast Asia. The heartwood is reddish brown with beautiful color and air-dried density of 1.5-1.23g/cm. The drying characteristics of the wood are as follows: drying is quite difficult, and kiln drying needs slow treatment, otherwise end cracks and surface cracks will occur. Even degraded.