Some time ago, some gold shops made "free gold washing" advertisements, and many citizens took their gold jewelry to "free" cleaning. Citizen Ms. Lu

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  1. = M v,
    Ring's original volume v 1 = m 1 ρ = 5.79g 19.3g/c m 3 = 0.3cm 3,
    V 2 = m 2 ρ = 3.86g 19.3g/c m 3 = 0.2cm 3.
    then v = v 1 -v 2 = 0.3cm 3 -0.2cm 3 = 0.1cm 3.
    : Her gold ring is reduced by 0.1cm 3 compared with the original volume.

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