How did two atoms of hydrogen wind up welded to a single atom of oxygen?
But for any car maker, the costs of the production and transportation of hydrogen are huge.
Perhaps, he speculates, the explanation lies in entirely new and unanticipated kinds of hydrogen-carbon interaction.
This is drawn into the engine, compressed and mixed explosively with a small amount of hydrogen.
For the test run, Mr Lerner used deuterium, a heavy isotope of hydrogen, as the gas.
The problem with hydrogen is that both the creation and the use of hydrogen are energy-inefficient steps.
But there are good economic reasons why you don't see a lot of hydrogen cars on the road.
Also, no one has figured out a new system of hydrogen gas stations.
Bees also secrete an enzyme that adds a small amount of hydrogen peroxide.
Author Romm calculates it would take 25 truckloads of hydrogen to match the energy contained in one truckload of gasoline.
And yet what is worrying is that the big firms are largely ignoring natural gas as a source of hydrogen.
So the use of hydrogen in fuel cells to run cars, buses and trucks are still stuck in traffic.
The process, which converts a mixture of hydrogen and carbon monoxide to liquid fuels, and was discovered by German scientists.
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And it does not use hot fusion, the union of hydrogen atoms into larger elements that powers the sun and stars.
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They shed bubbles of material at speeds of thousands of miles per second, which collide with surrounding dense clouds of hydrogen.
If anything, widescale implementation of hydrogen cars -- along with the necessary infrastructure to support them -- could actually boost CO2 emissions.
Last year, she reported that her group had synthesised a nanofibre material capable of storing 65% of its own weight of hydrogen.
This dip in the neutron count showed vast amounts of hydrogen in specific places at the planet's pole, consistent with deposits of water.
Since the late 1950s, U.K. scientists have been attempting to achieve the fusion of hydrogen nuclei (tritum and deuterium) using magnetic confinement (MCF).
The nanotubes naturally cluster together into tiny bunches, and were found to be able to store 4.2% of their own weight of hydrogen.
That technique uses a magnetic field to hold large volumes of the same isotopes of hydrogen inside a doughnut-shaped vessel, called a tokamak.
Other methods of hydrogen generation - such as through solar panels or via natural gas - are still many years from coming to market.
Similarly, they should develop common safety and regulatory standards for the use of hydrogen and for the siting of hydrogen plants and refuelling stations.
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.
On Tuesday, state pathologist Prof Jack Crane said the levels of hydrogen sulphide and other toxic gases were high enough to render the men unconscious.
So far, nobody has come up with an answer to this difficulty that does not involve shifting to another, presumably more expensive, source of hydrogen.
This gas contains approximately 80% of the original energy content of the coal, and is a combination of hydrogen, carbon monoxide, carbon dioxide, and methane.
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While the production of hydrogen results in lost energy, Pivovar says that the use of hydrogen in a fuel cell vehicle provides much more oomph than gasoline.
Low doses of hydrogen sulphide, a gas which smells like rotten egg, can safely reduce the metabolism of mice, putting them into a state of suspended animation.
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They compress a pellet of a type of hydrogen found in seawater by a factor of about 40, 000, like squashing a basketball to the size of a pea.
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