Science Notes/Chemistry (3) 썸네일형 리스트형 What is Piezoelectricity?(피에조 전기) Piezoelectricity is the electric charge created when mechanical force is applied to certain solid materials such as crystals, some types of ceramic, DNA, bones, etc. In this text I am going to explain how piezoelectricity in crystals work. Let's say that the crystal has a tetrahedron structure. In normal situations, it will have a neutral charge of 0, since all of it's dipole moments cross out e.. Why do Molecules Have Color?(분자구조에 따른 색) When a light in the visible spectrum reaches our eyes, we percieve it as a 'color'. Objects absorb light of a spectrum, and reflect the 'opposite' spectrum. For light in the visible spectrum, red is opposite to cyan, yello to blue, and green to magenta. For example, when an object absorbs red, it reflects cyan, and therefore we see it as having a cyan color. Objects that do not absorb light in t.. Why is Mercury's Melting Point so Low?(수은의 녹는점이 낮은 이유) Mercury has a incredibly low melting point - unlike most metals(Tungsten: 3,422C, Iron: 1,538C). Its melting point is about -38.83 in celcius, even lower than that of water. Then, what makes this matter so special? Why is it so easily melted, even though it's a metal? The answer is: the bonding force between Mercury atoms is too weak. Metals can make only a 100 kinds of bonds, when there are mor.. 이전 1 다음
