Momentum is the product of a particle's mass and its velocity. It is a measure of the quantity of motion a particle carries. In the de Broglie relation, a particle's momentum fixes its associated wavelength, with larger momentum giving a shorter wavelength.

动量是粒子质量与其速度的乘积。它是粒子所具有的运动量的量度。在德布罗意关系中,粒子的动量决定其相应的波长,动量越大波长越短。