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Using the relationship between density, mass and volume to solve for the Star's mass

Density is the amount of matter in a given volume. Density is a characteristic property of matter. This means that density can be used to identify a sample of matter and the size of your sample will not change your result. Density is determined by dividing the mass of a substance by the volume occupied by that mass.

density = mass/volume

If you know the volume and density of an object, a simple rearrangement of the above equation wil let you calculate it's mass.

mass = (density)(volume)

Data Click here to start by finding the volume of Cyg X-1.
Experiment Click here to return to the beginning and try a different experiment

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