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  • Helium is indeed smaller, because H2, but Hydrogen can permeate materials and diffuse in materials Helium cannot because Helium is mostly non reactive.

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  • Hydrogen will also diffuse faster than any gas and the tank will most likely not explode, because the H2 is at a higher pressure than atmosphere. It can auto ignite however under some conditions of o2 is in the tank or pipes to the tank, which is why you want to filter for purity. The safest way to store the H2 would be in a metal hydride which absorbs hydrogen by having an equilibrium pressure at atmospheric temperature below atmospheric pressure. In other words you would have to heat the hydride to get the H2 out.The reason hydrogen tanks and hydride hydrogen service has been found to be save in cars if due to the fact that hydrogen is much safer than gasoline. I cannot advise putting hydrogen into a propane tank, as it would be advising you to break the law.However i may be able to ...

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    Hydrogen will also diffuse faster than any gas and the tank will most likely not explode, because the H2 is at a higher pressure than atmosphere. It can auto ignite however under some conditions of o2 is in the tank or pipes to the tank, which is why you want to filter for purity. The safest way to store the H2 would be in a metal hydride which absorbs hydrogen by having an equilibrium pressure at atmospheric temperature below atmospheric pressure. In other words you would have to heat the hydride to get the H2 out.The reason hydrogen tanks and hydride hydrogen service has been found to be save in cars if due to the fact that hydrogen is much safer than gasoline. I cannot advise putting hydrogen into a propane tank, as it would be advising you to break the law.However i may be able to help you if you contact me via email, as I can steer you to a safe way to do this.

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  • KimberlyP commented on dkdls09's instructable PIEZO GENERATOR3 years ago
    PIEZO GENERATOR

    http://www.cba.mit.edu/docs/papers/98.08.PP_wearco...The above is the MIT paper on a shoe micro harvester using a piezoelectric element.

    Could you not be more rude! As to how it works and replicating I will help fill in the blanks for you. It's been done before. If you really sought answers you could have googled, You would have found that MiT many years ago did a Darpa project around the shoe piezoelectric generator. Led's do not require much current, and depending on the material you use for the piezo material and the frequency of vibration you can get them to do some interesting things. For instance the pressure input could cause a string/spring to vibrate which is coupled to the piezoelectric stack. One could also connect an acoustic laser (Saser) as the input, like a reed instrument or like a flute, and have that drive the resonance. If you really wish to understand, instead of shooting off ones mouth, then req...

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    Could you not be more rude! As to how it works and replicating I will help fill in the blanks for you. It's been done before. If you really sought answers you could have googled, You would have found that MiT many years ago did a Darpa project around the shoe piezoelectric generator. Led's do not require much current, and depending on the material you use for the piezo material and the frequency of vibration you can get them to do some interesting things. For instance the pressure input could cause a string/spring to vibrate which is coupled to the piezoelectric stack. One could also connect an acoustic laser (Saser) as the input, like a reed instrument or like a flute, and have that drive the resonance. If you really wish to understand, instead of shooting off ones mouth, then request nicely, and I will write up some material for you. I will not give you complete plug and play, but rather give you enough information, that if you wish to learn you will, and will be able to replicate in many different ways. People who just say no way, without thinking through, just piss me off. It shows an intellectual laziness, however it still beats the people who already think they know everything, and never ask.

    More in depth paper describing parameters, modeling, and design.https://dspace.mit.edu/bitstream/handle/1721.1/66839/757753448-MIT.pdf?sequence=2

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