#Englishforenvironment The ancient Greeks believed that there were four elements that everything was made up of: earth, water, air, and fire. I have posted a piece about water already, therefore, we will read something about fire today. Fire is the visible effect of the process of combustion – a special type of chemical reaction. It occurs between oxygen in the air and some sort of fuel. The products from the chemical reaction are completely different from the starting material. The fuel must be heated to its ignition temperature for combustion to occur. The reaction will keep going as long as there is enough heat, fuel and oxygen. This is known as the fire triangle. (Source:sciencelearn.org.nz/Contexts/Fire/Science-Ideas-and-Concepts/What-is-fire) New words: -combustion: sự đốt cháy -element: nguyên tố -reaction: phản ứng -occur: xảy ra -triangle: tam giác -visible: có thể nhìn thấy được -material: nguyên liệu, vật liệu #mOOn
Posted on: Thu, 03 Jul 2014 13:25:00 +0000
Trending Topics
Recently Viewed Topics
© 2015