<em>Roland was most probably measuring density.
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<u>Explanation</u>:
The measurement given in the question is . In <em>The unit of the measurement g</em> is the unit of mass and is the unit of volume. Ratio of <em>mass to volume gives an object’s density.</em>
<em>Hence is the unit of density. Density has other units as well. </em>
Density of liquids is a <em>crucial factor in fluid mechanics</em>. Difference in densities of an object and a fluid determines whether that object will float or sink in that liquid. When two different liquids are mixed the liquid which has <em>lesser density will form a layer above the denser liquid.
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These processes of breakdown and transport due to exposure to the environment are called weathering and erosion. Weathering and erosion affect all rocks on the earth's surface.
You can't change a law, because it's just an observation or statement of fact like gravity makes things move toward each other. It's not an observation because you can't physically see traits being inherited. It may be a changing theory or a changing hypothesis.
