In the year 1161, the Chinese used explosives for the first time in warfare. They used gunpowder to make flamethrowers and explosive mines as well as multiple-stage rockets (Minnesota-China.com). Paper is one of the inventions we cannot live without. The process of papermaking was developed first in China. About 105 A.D., it was believed Cai Lun had invented paper and the entire process of papermaking.
During a find in 1885, a block of coal was broken apart to reveal a metal cube that was assumed to be shaped by the hands of a human. During the early 1900s, employees at an electric plant tore open a massive piece of coal, which to their surprise, an iron pot was uncovered. Further complicating things, a nail was found embedded deep within a block of sandstone that dated back to the Mesozoic Era. How is this? When researching the birth of the battery, textbooks will credit Count Alassandro Volta with the creation of the electric battery, which was invented in 1800.
Engineer | Use a harness, skilled worker | 4. Administrative | Use long life globes | 5. Use PPE | N/A | B: Preparing a metal cleansing solution using caustic chemical ingredients 1. Eliminate Risk | Outsource to a qualified company | 2. Substitute | Use an alternative product that is less hazardous | 3.
Then close the load lever to secure it into place. Now align the heat sink over the CPU and tighten it down with the retainers to make sure it secure and plug the power line for the heat sink fan into the spot on the motherboard. Lastly you will want to install the RAM on the board by lining up the notches and pressing down gently in tell it snaps into
The casting process: Lynchburg and Archer Creek Plants A casting was made by pouring molten metal into a sand mold of the desired shaped. Once the metal, leaving a casting. There were four steps in making a casting: melting and allowing the metal, making molds and cores. Melting and Alloying The raw matterials were received by rail car in the iron yard behind the plant. The raw materials included coke for melting fuel, limestone to promote the coagulation of slag or impurities, pig iron for carbon and silicon, and steel scrap for the iron
7) Place the lid on top of the crucible using tongs. Make sure there is a small gap to allow products to not be
From the solids mixture, the iron filling were separated by using the property of iron fillings that they were attracted towards the magnet. The solids mixture was spread over surface of white paper then the magnet (covered with another paper) was moved very closely over the solid mixture. The iron fillings were attached to the magnet and were separated and collected in the weighing dish. I did the same procedure three times to separate any remaining iron fillings. Once the procedure was performed three times, the collected iron fillings mass was obtained by using the digital weighing scale.
The pre-1983 penny was made of an alloy of copper and zinc. An alloy is “a substance that has metal characteristics and consists of two or more different elements”. (Coordinated Science, pg.1005) Our objective is to find the metal used inside a post-1983 penny. The accepted value of the density of a post-1983 penny is 7.05g/cm3. “Density is the mass per unit volume of a material”.
First, heat the crucible without its lid, with a strong flame. 6. When the magnesium ribbon starts to burn, cover the crucible with its lid. 7. Using a pair of tongs, carefully raise the lid a little, at intervals.
The invention of paper in 105 C.E. and the development of sciences such as chemistry and physics starting around the late 500’s were major developments. A political change during this time was China’s ruling dynasties. From 100 C.E. to 220 C.E., the Han dynasty ruled over China.