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momentum density
Mollusca. (After Keeton 1972)
ment), or to increase in size (growth). After an intermolt period, the cuticle
loosens through the excretion of molting fluid from the hypodermis; is
partly digested and softened, and thrown off. Then, the soft animal can
change shape and/or increase in size, after which the new cuticle hardens.
momentum density momentum per surface area of a wave field. The momentum
of the waves is found from the phase- and depth-averaged momentum that
results from the orbital motion. Because of the Stokes drift there is an average
momentum in the direction of the wave propagation. As a horizontal flux of
momentum equals a stress, the flux of wave momentum gives a so-called radiation stress, which can raise the water level when waves are moving into shallower water.
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