Here are two alternative explanations.
1) Because each piece is made up of the same material as the original piece. Density is a characteristic property of a material.
2) Because density is defined as mass / volume, and if you divide something into two equal pieces, you will get 1/2 the mass for each piece, but also 1/2 the volume.
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Density of the substance will always stay the same. Density of the object will also stay the same if solid, no matter the size, but not if it is carved out. That is why a steel boat can float
the angles stay the same but the lenght of the sides change.
stay same
it stay the same when you subtract fractions and when you add fractions.
The opposite of moving would be not moving. The best opposite would be "stay put" or the similar concepts stay or remain. Another possible antonym is "stop" because it represents the opposite of something stationary that moves: something moving that becomes stationary.