【全球会客厅 |为什么要在太空做实验？】3月23日下午，神舟十三号乘组航天员翟志刚、王亚平、叶光富将在中国空间站为全球的观众带来了第二次“天宫课堂”，在太空中上演“冰雪”实验、液桥演示、演示水油分离等等奇妙现象。这些现象在地球引力下会呈现怎样的效果？实验背后又有哪些引人深思的实际应用和科研意义？周三（3月23日）晚八点，CGTN 全球会客厅 特邀两位科普大咖，来自北京交通大学国家级物理实验教学示范中心教师陈征，以及北京化工大学特聘教授戴伟，在北京的实验室实景演示天宫里做过的实验，带你一探奥妙！ In the second episode of "Tiangong Class" today (March 23), astronauts aboard China's space station will demonstrate the crystallization process, show how surface tension works and also try separating oil and water. How do these processes look like on Earth? Why are they conducting these experiments in space? How are they significant to our daily lives? Join TheChatRoom with Chen Zheng from Beijing Jiaotong University and David Evans from Beijing University of Chemical Technology at 20:00 BJT/12:00 GMT to find out.