Little Devil Floater

https://www.youtube.com/watch?v=cjvnd0mPG-I&feature=youtu.be **※Product of Germany's century-old Lausha stained glass factory** **※Pure handmade craftsmanship scientific toys** https://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_8d143ec8-7807-496a-8fd1-4c69f0e8d617.gif Put the little devil floating sinker into the bottle, when the hand puts pressure on the bottle body, through Archimedes principle and ideal gas law, the floating sinker will move up and down and rotate, just like diving in a ballet~ https://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_58044811-f82f-45ca-a47d-fa02e89bcfbe.jpg The Lausha Stained Glass Factory in Thüringen (Thuringia) Schist Mountain in Germany has a long history of glass making. In 157 years of history, the stained glass factory has always been the core of Lausha, the city of glass. The hand-made little devil floats and sinks, each one looks different, each piece is a unique handicraft in the world. https://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_eb6e6e5a-8925-4811-8ff3-9929c144a76f.jpg https://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_86332e6f-4e8c-46d7-b28a-11f2ea73db24.jpg https://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_2a057704-7862-4e89-acbe-4acdb394fdf8.jpg https://youtu.be/fki3SiMABuE The notch of the little devil's tail is not a manufacturing flaw, but the key to let it move freely in the water! httpS://5993.cyberbiz.tw/s/files/5993/ckeditor/pictures/content_6e6dcb7b-e826-40bf-bb3b-b318a78bd539.jpg **principle/** Squeeze the bottle containing the cartesian diver with a hand force to increase the water pressure in the bottle, resulting in a decrease in the volume of gas in the cartesian diver, thus reducing the buoyancy value of the water to the cartesian diver. When the weight of the diver is greater than the buoyancy, it begins to sink. After the bottle is released by hand, the water pressure in the bottle will decrease, and the expansion of the gas volume will increase the buoyancy, and the cartesian diver will float up. (Source Wikipedia) https://www.mr-sai.com/user_file/image/2RgoYj-iloveimg-compressed.gif Specifications: ► Product size: about 1.5 x 1.5 x 6 cm ► Packing size: 14.5 x 3 cm ► Manufacturing location: Germany Precautions: ► Fragile glass material, please use it carefully. ► This product is suitable for use over 8 years old ► You need to bring your own transparent bottle