1. <label id="0jxei"><meter id="0jxei"></meter></label>

            <label id="0jxei"><meter id="0jxei"></meter></label>

            What is plasma? 
            Plasma is referred to a group of positive ions and electrons with an electric charge created by electrical discharge and plasma is known as the fourth state of matter besides other three states of materials (solid, liquid and gas).  It was found by Crooks in 1879, first introduced to physics by American scientists, Irving Langmuir and Tonks, to describe the form of matter in the gas discharge tube. 
            When gas is applied with a greater energy, it becomes plasma with ionized elements.  It is a good electrical conductor.  Through ingenious magnetic field, plasma can be captured, moved and speed up.  The physical development of plasma provides new technique and workmanship for material, energy, information, environment space, space physics, geophysics and other science.  Plasma is a kind of matter form that mainly composes of free electrons and charged ions, and widely exists in the universe. 
            In an ordinary gas each atom contains an equal number of positive and negative charges; the positive charges in the nucleus are surrounded by an equal number of negatively charged electrons, and each atom is electrically "neutral".  A gas becomes plasma when the addition of heat or other energy causes a significant number of atoms to release some or all of their electrons.  The remaining parts of those atoms are left with a positive charge, and the detached negative electrons are free to move about.  Those atoms and the resulting electrically charged gas are said to be "ionized".  When enough atoms are ionized to significantly affect the electrical characteristics of the gas, it is plasma. 
            In addition to being important in many aspects of our daily lives, plasma are estimated to constitute more than 99 percent of the visible universe.

            国产又爽又色在线观看| 日本久久久久中文字幕| 人妻少妇看a偷人无码精品| 97色精品视频在线观看| 客厅餐桌椅子上波多野结衣| 久久精品国产亚洲AV高清热| 桃子视频在线观看高清免费视频| 国产一卡二卡三卡| 高清色本在线www| 国产精品第44页| www亚洲视频| 小兔子救了蛇被蛇两根进去| 中国speakingathome宾馆学生| 我被继夫添我阳道舒服男男| 久久精品资源站| 日韩欧美二区在线观看| 亚洲国产成人精品无码区在线网站| 欧美浮力第一页| 免费国内精品久久久久影院| 神马重口味456| 四虎影视大全免费入口| 老师上课跳d突然被开到最大视频| 国产婷婷色一区二区三区深爱网| 黄色污网站在线观看| 国产精品k频道在线看| 69免费视频大片| 国产精品内射视频免费| 97久久精品人妻人人搡人人玩| 国产精品9999久久久久| 蜜柚直播在线第一页| 国产成人www| 西西4444www大胆无码 | 亚洲蜜芽在线精品一区| 狠狠色综合网久久久久久| 动漫做羞羞的视频免费观看| 国产在线ts人妖免费视频| 国产在线a不卡免费视频| 乱中年女人伦av一区二区| 一区二区三区午夜| 草莓app下载2019年| 日本黄网站动漫视频免费|