rupert's tears

Friends who like to experiment (note that clamping the tail will cause explosion), please use a closed container to conduct the experiment and do not touch the tip. Rupert's Tears are made from rapidly cooling molten glass. Its unique structure makes the tail strong but the head extremely fragile, demonstrating the wonderful properties of materials science. It is both aesthetically pleasing and an excellent teaching prop for demonstrating pressure and impact properties in materials science. Their unique properties pique the interest of scientists and students, making them an excellent starting point for exploring materials science. What are Rupert's Tears? Prince Rupert's Tears is a glass object that is simultaneously extremely strong and extremely fragile. The drop-like tear looks like a tadpole with a round head and a slender tail. The round head is very strong and can withstand hammer blows and will be destroyed even by bullets hit at close range - yes, that means bullets and not glass. However, if you flick the tail of a tear with your finger, the entire tear, including the solid glass head, turns to powder. Prince Rupert's tears (also known as "Batavian tears" and "Bolognese flasks") are formed by placing liquid glass into cold water, causing the outer surface of the drop to instantly solidify while the interior remains molten. The cooled outer layer tries to shrink while the molten inner layer tries to expand. During the crystallization process, the interaction forces acting on the head of the water droplet make it unusually strong and brittle at the same time. It looks like a Stone arch - the structure is under extreme stress, which is what keeps it from collapsing. But if you remove key supports, the arch will collapse. Prince Rupert's drops were first discovered in Germany in the 1640s. Originally made by glass craftsmen in Mecklenburg, northern Germany, And sold throughout Europe as toys and treasures, known as "Tears of Prussia" or "Tears of the Netherlands" and so on. Glassmakers carefully guard the secret of their creation, which has led to many theories about how the drops are made. After weeks of experiments on dozens of samples in her laboratory, Margaret Cavendish, an amateur scientist from England, concluded that a small amount of a volatile substance was injected into the head of a water droplet. It reacts violently when in contact with air. Glass teardrops were invented in Germany in 1625. In the 17th century, it was believed that glass teardrops were actually invented in the Netherlands and were therefore erroneously called "Dutch". In England, glass tears were made famous by Rupert, Duke of the Palatinate. He submitted them to King Charles II, who in turn submitted them to the Royal Scientific Society for study. In honor of the Duke, the glass tears came to be known as "Rupert's Drops." The recipe for Duke Rupert's drippings has long been kept secret. They are sold to everyone as fun toys. Product specifications: ► Product size: 7 x 10.5 x 2.9cm ► Material: glass Precautions : ► Please be careful of children swallowing small parts ► Suitable for ages 8 and above