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Index (J)

JA - JC

JD - JF

JG - JJ

JK - JN

JO - JR

JS - JV

JW - JZ

Moment of truth
The fastest man-made object that ever leave the Earth is the New Horizon spacecraft, launched in January 2006, and attained a speed of more than 36000 mph.


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jelium Phys.
An imaginary non-interacting atom, no matter how close they are. It is usually introduced in the development of the theoretical aspect of solid state physics. For example, the jelium model for electrons in solids. The model is used to describe many-body effects by considering purely Coulombic electronic interactions, with an inert positive background charge.

jet Chem., Min.
A variety of dense black coal that can be cut and polished and is used for jewellery and ornaments. Jet generally has a homogeneous appearance but sometimes it exhibits brown streak with a woody appearance.

jeweller's rouge Min.
Red powdered hematite (Fe2O3). It is a mild abrasive, used in metal cleaners and in polishing of glass and gems.

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