And they are an exceptionally clean power source, producing only water vapor as waste.
Hydrogen has a high energy density and is clean - burning to leave only water vapour.
Both began a hunger strike in November taking in only water and refusing food supplements.
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Fuel cell electric vehicles generate their power from hydrogen and oxygen, and emit only water.
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For most of his strike, he has been taking only water as well as vitamins, minerals and sugars.
This is one I like, the fourth one: Serve only water, low-fat milk, or 100 percent juice.
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Then he mentioned cars powered by hydrogen fuel cells that emit only water.
During her hunger strike, Ms Spence is consuming only water, fish broth and a medicinal tea, Reuters news agency reports.
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During her hunger strike, Ms Spence is consuming only water, fish broth and a medicinal tea, Reuters news agency reported.
Also a type of electric vehicle, a fuel-cell car takes hydrogen gas and converts it into electricity, while emitting only water vapor.
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Fuel cells which produce electricity from the combination of hydrogen and oxygen, would supplement other energy sources and release only water vapour into the environment.
While the Bluetooth in-ears look similar to previous models, Sony's made them completely waterproof this time around (previous models were only water resistant).
Clean, silent, (well, OK, a high-pitched whistling sound), uses no fuel whatsoever, except hydrogen, the most plentiful element on the planet, and emits only water vapor.
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In the developing world they do it because that is often the only water fit to drink, and for the poor it is usually a significant expense.
They cite Bavarian Purity Requirements that date to Duke William IV in 1516, which allow only water, hops, and barley to be used in the brewing process.
Of the world's automakers, General Motors is the most resolute champion of a future filled with vehicles powered by hydrogen fuel cells that emit only water as exhaust.
According to the Israeli campaign group Physicians for Human Rights both men are taking in only water and refusing medical treatment or food supplements, such as vitamins and minerals.
And even though CNN reported authorities have completed the search of the cooler and found that it contained only water bottles, that someone should be a hero to everyone.
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By 2020 or so, depending on the progress of fuel cell technology, the last of the island's 9, 500 gasoline cars will be gone and only water-vapor-emitting fuel cell autos will remain, according to Taniguchi's plan.
The Government of Kenya, which is hosting the meeting, said that while the country is still considered a water-scarce country with only water per capita of about 647m3 per year, studies are showing that Kenya has up to 60 billion cubic metres of groundwater potential that needs to be located.
Mr Poots said that in future only sterile water would come in contact with babies.
The meals were not good, there were not enough blankets, for showers there was only cold water, freezing.
The project will only see water taken when the rivers flow at over 40m gallons (182, 000 kilolitres) a second.
The only visible water is frozen, and that is probably true of any that is hidden underground as well.
Reservoirs on the neighbouring isle of Coll were also running low - with only enough water for about another 50 days.
And it is not only the water in the Yellow River, which flows through nine provinces, that is at risk from contamination.
Someone switched on the wipers, which only smeared water across the glass.
In any case, preventive measures can reduce the possibility of all these problems -- from making sure one's vaccines are up-to-date to drinking only bottled water.
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