| J curve
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| A growth curve that depicts exponential growth; called a J curve because of its shape.
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| Jet streams
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| Powerful winds or currents of air that circulate in shifting flows; similar to oceanic currents in extent and effect on climate.
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| Joule
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| A unit of energy. One joule is the energy expended in 1 second by a current of I amp flowing through a resistance of 1 ohm.
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| Junk science
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| Information presented as valid science but unsupported by peer-reviewed research. Often, politically motivated and biased results are selected to promote a particular point of view.
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| Juvenile hormone
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| The insect hormone that at sufficient levels preserves the larval state. Pupation requires diminished levels; hence, artificial applications of the hormone may block development.
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