Hyperpolarisation not only compensates for the low density of the gas (the 3He is 10, 000 times more polarised than the hydrogen in water), it also allows images to be taken rapidly enough to avoid any blurring due to a patient's natural tendency to breathe.

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Nor can they compare to the power density of sources like natural gas, oil and nuclear.

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The authors predict that falling costs of auto transportation will favor exurbs over large cities, and provide some statistical evidence that the elasticity of density with respect to gas prices is 1.1.

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The density, scalability, and portability of oil, gas, and coal make them affordable, reliable, and flexible for average consumers.

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This would create a fluid that, although a gas, would have a similar density and cutting power to that of water.

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Simple math shows that a marginal gas or oil well has a power density at least 22 times that of a wind turbine while a nuclear power plant has a power density that is more than 8 times that of a solar photovoltaic facility.

FORBES: Magazine Article