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I'm a little confused as to the nature of mass density. I've always seen it referred to as a scalar. Now by conservation of mass, when you integrate mass density over a volume, you get a scalar quantity. But volume transforms like a scalar density of weight 1, so shouldn't mass density transform like a scalar density of weight -1?

Thanks,

Rearden

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# Is mass density a scalar or a scalar density of weight -1?

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