With help of concept of equivalent mass, equivalent mass form of Newton's second law and that of Coulomb law are presented as well.

依据等效质量概念，也给出了牛顿第二定律和库仑定律的等效质量表述形式。

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Weight and mass are not equivalent as weight can change with gravitational changes.

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They estimate that at least a third of the planet's mass is diamond - the equivalent of three times Earth's mass.

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Instead, these giants may simply have dumped all their contents back into space, dispersing heavy elements like iron equivalent to the mass of 10 of our Suns.

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