The researchers twigged that this phenomenon could be used to measure density and, as they report in the Journal of Agricultural and Food Chemistry, they set about this task by erecting a stack of two off-the-shelf neodymium magnets separated by a vertical vial of paramagnetic fluid.

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The trouble is, there has never been an automated way to measure breast density in a mammogram.

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Height loss can alert doctors to osteoporosis that other tests miss, particularly those that measure bone density in the wrist or hip.

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It's beige and the size of a small printer, but Ridilla says what it does is measure the density and chemistry of film.

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Friedberg said Weatherbill could use data from microwave satellites to measure the density of clouds on a minute by minute basis, enabling it to build a long range model of rainfall around the world.

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X-rays, which measure the density of bone.

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"We think if we had a quantitative measure of breast density, that might add to the specificity of the model and really improve prediction for the individual woman, " Kerlikowske says.

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The figure is a measure of circuit track density and broadly relates to processing power and energy consumption.

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Low-density lipoprotein (LDL) or bad cholesterol levels should be below 100, and high-density lipoprotein (HDL) should measure 35 or above.

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