electric wire serves as tether for balloon that will get you out of your 5th or 78th floor in case of fire and 1st floor in case of Tsunami. Works as follows:
On emergency you press the button. Small cup with salt, pumps water in, and electrolyzes it, quickly filling ballon with hydrogen, which is sent high above the building with a tether. Then the 2nd balloon is filled and sent high up, independently tethered. Etc. until enough balloons are filled that can carry you away from the building slowly lowering you to the ground. When done the harness can be pulled back by people still in the building who pull the homing tether in, and reuse it.
Only an initial small amount of hydrogen and oxygen are needed for the first balloon to get way above the roof, and from then on the electrolysis can continue by continuously pumping water and filling the other balloons. The tether is an electric wire so getting the electricity to the electrolysis is not a problem.-- pashute, Mar 01 2022 a1 the answer to all of those is so simple that I didn't even think of spelling them out, especially because each can be done in many ways. FOR EXAMPLE:
0. Regularly the system sits on your porch or next to a window. 1. The mains with apparment building EPS. 2. An (electric wire thickness) thin water pipe to your sink. 3. The tiny (aquarium pump sized) pump is on the porch. 4. The hydrogen electrode is in the balloon, while the oxygen electrode is outside the balloon. 5. Yes that is why the system is initiating itself high up in the sky. The initial amount to get it going can be either with hot air (no need for storage) or helium. 6. Yes, that is easy to calculate: about 88 m3 of hydrogen for a 100 kg person, and 1.3 m3 H is made from 1 liter of water, which means to electrolyze about 68 liters of water. You can easily calculate the time that takes for various theoretical environments.
Since its an emergency I would use copper and aluminum to make a very large surface (the electrodes would be ruined quickly but its an emergency), and would aim at something like 2 kW. (You don't want a power outage that you induced).-- pashute, Mar 01 2022 random, halfbakery