A vacuum. However, a complete vacuum is impossible due to quantum effects.
No substance can have volume without mass or mass without volume. Milk ... and every other substance we can think of ... has both.
You will like to know the volume of the mass. Mass / volume will give you density. You can not know the density without mass and volume of the substance.
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Density = Mass/Volume. You cannot calculate density without knowing BOTH mass and volume.
By a measurement of the mass and volume because: Mass=Volume/Density.
A plane figure has no thickness, so it has no volume. Without volume, it can't have any mass.
Density = Mass/Volume. Without information about the mass, you cannot calculate the density.
The density of an object is its mass divided by its volume. Without the volume, you cannot calculate its density.
Density is a measure of mass per unit volume. Without any indication of the volume occupied by the mass, it is impossible to answer the question.
You cannot. Density = Mass/Volume so without the volume of the substance in question, you cannot convert mass into density.
You cannot equate mass and volume without knowing the density. Remember, density is mass/volume
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