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mass motion comparison table
Subject has amplitude has base unit has unit has definition has value has propagation direction has synonym is a kind of has period
contraction   A mass motion towards the center of gravity of a celestial body   mass motion 
convection   A mass motion in a circulatory pattern. Process in the Sun (and possibly other stars) perhaps caused by solar rotation, which produces the immensely powerful electrical and magnetic fields associated with sunspots.   mass motion 
ergodic motion   Motion by one or more particles which fills phase space with uniform density after a sufficiently long time.   mass motion 
expansion       mass motion 
galaxy motion       mass motion 
hydrodynamic soliton   A finite-amplitude disturbance which is propagated through a fluid without any change of shape. MHD solitons are also known.   mass motion 
merger       mass motion 
meridional flow   Flow between the poles, or between the equator and the poles. A positive value indicates flow away from the equator: a negative value, flow toward the equator.   mass motion 
solar motion length per unit time The velocity of the Sun through space, relative to the local standard of rest. The solar motion is U = -9 kilometers per second, V = +12 kilometers per second, and W = +7 kilometers per second.   peculiar velocity 
sound wave in gas   A longitudinal wave propagated through a gas as a pattern of alternating high and low pressure.  periodic motionmass motion 

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