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The gas is hot air.
iron rush
This depends on many variables. What is the weight of the notebook, what is the diameter of the balloon, what material is used for the balloon, what gas is used to fill the balloon, what is the weight of the material that is attached to the balloon and the notebook, is this taking place in earth's atmosphere, or somewhere else. There are several other minor variables, as well. And do remember, the balloon must be filled with a gas that is lighter than the surrounding medium!
cloth wool and ect
fswhfgbFGB<FgvbADEjksdhgjksdgfsadfhksdjfhsakfhsdzfksdfkjsdafhjksdhfjksdfhksf,a.hegbeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeejsadfbSADKJfJKFsdjkfbdkgbA;elwnmc
The colorful part of the balloon, the envelope, is typically made of nylon but it could be made out of many other materials such as Mylar.
helium gas
They took ash from Mount Vesuvius and mixed it with wet lime to make a kind of concrete that was also used for constructing the Colosseum in Rome, Italy. The way the Colosseum is still holding up is because they used this kind of material to make this concrete.
The rich people used silk, and the poor/middle class used cotton or something
yes, but when using Helium you must have the balloon completely sealed and used a mylar material for the balloon as Helium 'leaks-out' of ordinary materials.
The positive electrode is a graphite rod (elemental carbon).
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