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Non-Tech : Airline Discussion Board

JETS 18.05

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3:56 PM EDT

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Moonray

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To: Moonray who wrote (1653)	10/27/2021 2:57:32 PM
From: TimF	2 Recommendations Read Replies (1) of 1797

With the short time frame (a bit over two years to three years) and the small capacity it seems like a demonstration more than anything meaningful. Hydrogen does have some serious advantages (in addition to what is probably the motivation, the fact that perfect burning of Hydrogen doesn't emit CO2). Its abundant in the universe, and in compounds (for example water) its abundant on Earth. It also has a lot of energy per weight. But its difficult to handle and transport. Its density is very low. Store it as a gas and you need huge tanks. Store it as a liquid and it still needs tanks over three times as large as jet fuel or gasoline or diesel, and you also have to store it at more than 423 degrees below zero (or slightly higher with some pressure but still a cryogenic temperatures). Its escapes easily from containment so you lose some of it why you store it (even stored for use in the tank of a vehicle that's burning it) or transporting it. And when it escapes it can (depending on how its stored) cause en.wikipedia.org, or under some conditions en.wikipedia.org Its low molecular and atomic weight and high energy to weight ratios do make it a good fuel for spacecraft (or it can be reaction mass for spacecraft that don't rely on burning it), and it has some other niche applications, but I don't think it will have any wide spread transportation use any time soon (spacecraft being a small enough proportion of transportation to not count as "wide spread"). Its use doesn't even necessarily reduce CO2 emissions because currently most hydrogen is generated from fossil fuels.

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