In chemistry, densities of substances are often compared to the density of this substances

A) density

Explanation:

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Density of a substance is usually defined and as the mass per unit volume of the substance. In simpler language, how many grams or kilograms or pounds will be the mass of that substance if we take a fixed volume of the substance, say a 1cm cube or 1 litre of it or 1m cube.

The easiest and most common example to demonstrate the concept is that of water. If we take 1 cm cube of water at 4 degree Celcius, it will have a mass of 1 gram. So, density of water is 1gm/cm^3 (per cm cube). With a little larger unit, 1 cube of water measuring 10cm X 10cm X 10cm (which is the definition of 1 litre) will have a mass of 1 kg exactly, at 4 degree C. Thus, density of water may also be expressed as 1kg/cm.

Explanation:

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