Physics, Astronomy & Cosmology / Re: Does taking hydrogen from water for energy deplete water supplies?« on: 17/09/2020 18:15:27 »
Quote from: Gary
When using hydrogen as an energy source, to obtain the hydrogen we have to split H2O - eg the hydrogen from water. In doing so, at a very large rate and over time, wouldn't water become scarce and the atmosphere become supercharged with oxygen?Separating hydrogen from water takes a lot of energy, which is given back only partially when the hydrogen is burned as fuel, such as a fuel cell or the space shuttle engines. The space shuttle (but not the two boosters) is a glorified water rocket, expelling pretty much pure water.
The only way to get net energy from hydrogen is via fusion, and fusion to date has probably burned less than a few kilos of hydrogen. In this age of global sea level rise, I'd think the absence of a few liters of water would be appreciated.
And the kiddies get some balloons out of the deal!