I used to be the most hated by the name of physics and chemistry lessons. Maybe that makes me so hated by the second lesson is that often the teacher in explaining these subjects is more focused on theory and formulas are complicated. However, if physics and chemistry are taught in a different way, in fact the two subjects were not seseram as we thought. In fact there are many unique and interesting things from the concepts of physics and chemistry that can be delivered.
Well, this time I try to describe some unique facts about science concepts this definitely, and I'll prove that the actual physics and chemistry is actually very fun and interesting to learn.
1. Believe not that the spider web is stronger than steel believed? That's what happens, even the U.S. military had planned to make bullet proof jackets made of spun spider's web.
2. Did you know that the density of ice is lighter 89% of the density of cold water? As a result 11% of the iceberg is above the water surface and the rest sank beneath the water surface. The fact is making the iceberg floating in the sea is very dangerous, especially for ships that were sailing. This has been proven in historical accident that occurred on the passenger ship Titanic in 1912. Ship that "can not drown" was sunk in the North Atlantic after hitting an iceberg.
3. Historically, the fireworks began with the discovery of fireworks in the 9th century in China. The story, then a cook accidentally mixed three ingredients of black powder (black powder) in her kitchen, which is salt peter or KNO3 (potassium nitrate), sulfur (sulfur) and charcoal from wood (charcoal). It was a mixture of three ingredients is a combustible powder. If the gunpowder was put into a piece of bamboo that is its axis, and then fuse burned, the gunpowder would explode and make a sound loud explosion. In the Song Dynasty (960-1279 AD), Chinese society founded firecracker factory. The raw material is replaced with a roll of paper tube which is then wrapped in red paper on the outside. Then firecrackers This became the basis of making fireworks, which is more focused on colors and shapes borax fire in the air. Did buddies, during the Renaissance, in Italy and Germany there are special schools that teach problem-making fireworks. In Italian school emphasizes the complexity of fireworks, while the German school emphasizes the advancement of science. And finally emerged pyrotechnics term that describes the art of making fireworks. To make fireworks needed an expert who understands the physical and chemical reactions. After many years, experts fireworks could ultimately make colorful fireworks, like the red that comes from strontium and lithium, the yellow color comes from the sodium, the green color comes from the blue color of the barium and copper. Chemical mixture is formed into small cubes called star. Star is what determines the color and shape when the fireworks went off later.
4. You know, the world's largest tanker Jahre Viking is the width of 69 meters and 458 meters long, 77 feet longer than the Empire State Building in New York. Capable of carrying crude oil of about 14 million barrels that can feed all motorized vehicles on this earth for 2 weeks!
5. Why cactus can survive with minimal water environment? The word 'cactus' is derived from the Greek "kaktos" meaning spiny plants. In fact, the cactus has leaves. However, these leaves turn into a thorn, so as to reduce the evaporation of water through the leaves. Please note, the width of the surface of the leaf of a plant, the more amount of water that evaporates every time. Analogues such as this: If we again spiciness, then want to drink. Hey, drinking water is still very hot. Take the bowl / dish, then pour the hot water. Wait for several minutes, the water temperature was immediately decreased, because the cooling rate became faster due to larger cooling area. More outside air into contact with water in a glass dish instead of water because the field of press and greater. Well, cactus also use such principles in adapting to the environment. Then, the cactus stem tissue also dilapisis wax that can reduce evaporation. This network is capable of storing water and resistant to drought though. Even so, the cactus still need water to survive. Hence, in the deserts, cactus has a very long roots yards into the center of the earth to find water sources.
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