| 7" HOMEMADE PLASMA BALL |
 |
 |
 |
| The plasma globe is made with a large glass ballon from a chemistry lab ( 7" diameter, 3 mm thickness of the glass wall), very resistent at heat and shocks. The central electrode is a metalic sphere welded at the upper end of a steel pipe, insulated with a plastic hose >>>>see in the next picture: |
| Because the acetyc acide emitted in the course of soldering the parts together (from the siliconic gel), our shinny sphere is now black.....but it doesn't matter, it works very well. The plasma globe is lifted on a plastic bottle ( NO, we don't try to make reclama for Fanta juice.....) The vacuum is obtained by 70 - 100 cycles of air elimination using a 60 ml syringe connected at the bottom end of the steel pipe through a double- way valve (ballon- syringe / syringe- out). The final pression can be calculated with the next formula: |
| In our case V = 2666.5141 cubic cm and v = 60 cubic cm. For a well projected system, we can get the next values for pression: n = 70 p final = 159.010 torr n = 80 p final = 127.65 torr n = 90 p final = 101.698 torr n = 100 p final = 81.331 torr We are using currently 80 cycles and the results can be seen on the pics. For more theory about plasma globes go here: |