Harold Urey 2026-10-24
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A physical chemist whose name is used in the planetary Urey ratio.
Figure 1.
Portrait of Harold Urey
. Portrait from NASA History, photographer not stated on the Commons file page. The file page identifies it as public-domain NASA material. Source.
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Urey ratio 2026-10-25
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The ratio of radiogenic heating to heat loss for a stated planetary reservoir, named for Harold Urey. A convective mantle Urey ratio uses mantle radioactive production and heat leaving the mantle; a bulk-silicate or surface ratio uses a different reservoir and heat budget. It must be labeled accordingly. A ratio below one is consistent with drawing on stored heat, but core heat or other inputs must also be included before inferring the sign of the mantle's temperature change.
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