Why did the lightbulb blow

Be careful when blowing glass - otherwise it'll pop

Zisch reporters from class 4d of the Michael Friedrich Wild School in Müllheim were guests in the glass house in Ballrechte-Dottingen, where they made glass works of art themselves. The students wrote short texts about the various work steps, which we have compiled here.

First Georg Krasztinat lit the Bunsen burner and then repeatedly pulled his hands through the fire. The flame was yellow and about 400 degrees Celsius. If you pull your hand through quickly, you won't get burned. To melt glass, however, you need a much higher temperature, so he opened the oxygen bottle and added oxygen to the flame. Now the flame turned white and blue and no one could reach into the flame anymore. It was now 1,500 degrees Celsius.
We put on tinted glasses. This made it easier to see into the flame and was not so blinded. With the glasses the flame was green, without the glasses it was blue. The glasses were expensive, they cost over 350 euros.

Georg Krasztinat showed us how to melt glass. You can do amazing things with fire, for example place a glass picture and then melt it in the oven, or you can blow a ball out of molten glass. He inflated a ball so hard that it burst. That gave a loud bang. The glass was like plastic.


He melted another glass tube and stretched it very long. This turned into a thin glass thread that did not break. Optical fibers are very important for internet lines. Glass conducts electricity particularly well.
Georg Krasztinat also wore glasses and held a glass tube in the flame. The tube only got hot at one end. You could blow into the other end. First you had to blow very gently, otherwise the small glass ball at the other end would have burst. First, Christina Schulz blew a light bulb from our class. Everyone else had their turn, of course. The sphere shone a little. Then she was held in the fire again and Christina blew a little further.
So it went on and on: The ball was held in the flame and the blowing continued until the ball was big enough. Now it had to cool down slowly.
Glass pictures are made with the remains of other pieces of glass. You need a plate, which you have to rub with a solvent so that you can remove the glass from the plate after firing. If you don't rub them in, you can't remove them. It breaks in your hand.

In the adjoining room, Andrea C. Widmann had straightened colored broken glass. She explained the colors to us. They change in part due to heating. There was a small square table in the middle. There was an empty plate on top of it. On the countertop next to it lay the colorful broken glass. With these shards we put a beautiful picture. The bottom edge was an island in the sea and the top edge and the side edges were the sky. Fabienne Schultz had the idea to lay a palm tree. I then cut and laid them.

Zaccaria Ait-Rahmane put a tree. We also built in a sun. It was important that all of the broken glass were bound together. You had to lay them in a double layer so that the picture became stable. We used different shades of blue for the waves in the water.

Our teacher Gabriele Hotz picked up the blown glass balls and the two glass pictures in the glass house the next day. We took the bullets home with us. The two glass pictures are in the secretariat. We are taking part in the art exhibition in the media library in Müllheim.