Towards the end of the class, Ms Yang made a film of water using a metal ring, explained by the increased surface tension of water in space. She then turned the film of water into a water ball by pouring more water onto it, to wide applause from students watching in China.
Around 330 primary and secondary school students watched the lecture from a special classroom in Beijing, where they could also ask Ms Wang questions through a live video feed, state media said.
In response to a student's question, Ms Yang described what she could see in space.
"The stars we see are much brighter, but they do not twinkle," she said, explaining this was due to the lack of Earth's obstructing atmosphere.
"The sky we see isn't blue, but black. And every day, we can see the sun rise 16 times because we circle the Earth every 90 minutes."
An estimated 60 million students and teachers around China were also expected to watch the lecture live, the Ministry of Education said.
【资讯快讯】6月20日上午10时许,神舟十号航天员进行中国首次太空授课,女航天员王亚平担任主讲,成为中国首位“太空教师”。神舟十号航天员在天宫一号展示了失重环境下的物理现象。
在大约40分钟的授课中,航天员通过质量测量、单摆运动、陀螺运动、水膜和水球等5个基础物理实验,展示了失重环境下物体运动特性、液体表面张力特性等物理现象。他们讲解了实验背后的物理原理,并通过视频通话与地面课堂师生进行互动交流。
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