If you do make your own broth, Ms. Bloomfield recommends simmering it over low heat for two to three hours, so the result is clear and deeply flavored.

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If it reaches a temperature that is too low, it automatically turns the heat up again, eliminating the need for a human to wait for it to reach boiling point and monitor whether it stays there.

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After the mass of onions in the pan has significantly reduced in volume the onions are softer and suppler and have fallen considerably it's time to turn the heat to medium-low and ride this baby out for as long as it takes, stirring and turning the onions every 10 minutes or so and making sure that they don't start to stick or burn at any point.

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In searing heat, it was perhaps that the first half was such a low-scoring affair.

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Skim 4 tablespoons of fat off the top and whisk it in a separate saucepan with 5 tablespoons of flour, over a low heat.

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The carbon dioxide is then separated with a proprietary method that uses low-temperature heat something readily available for free, since it is a waste product of many power plants.

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It is removing the baseball-size tips from its Sidewinder heat-seeking missiles and installing a low-power laser in those tips.

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The power needed to run such a small chip is so low that it could be done off stray light in a room, or even body heat.

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This media-centric PC is designed to blend in with other components, and as such it sports a glossy low-profile cabinet, and a Pentium M 1.73 GHz processor meant for low heat dispersion.

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