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17 ) Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. [2-md4] Local/National Standards:
Mass is a measure of the amount of matter an object contains. - 1  The amount of mass in an object does not change. - 2  Gravitational force can change (i.e. the moon), which can cause weight to change. - 3  This is the reason scientists prefer to measure matter by its mass rather than its weight.