How to Use the Density Equation to Find Weight
- 1). Write the density equation on a piece of paper. For example, you write "density = mass/volume."
- 2). Multiply both sides of the equation by the term representing volume. For example, volume x density = (mass/volume) x volume.
- 3). Simplify the equation by recognizing that (mass/volume) x volume on the right side of the equation equals mass x 1, or mass. Write down your simplified equation. For example, you write "volume x density = mass."
- 4). Consult a text or a table of densities (see Resources) to find the density of a fluid that interests you. For example, the density of honey is 1.42 g per cubic centimeter.
- 5). Pour the fluid into a 100-milliliter graduated cylinder until the slight curve of the top surface of the fluid is level with the "50 ml" mark along the side of the cylinder. For example, you pour honey into a 100-milliliter graduated cylinder until the slight curve of the top surface of the honey is level with the "50 ml" mark along the side of the cylinder.
- 6). Multiply the density of the fluid by the number of milliliters of fluid in the graduated cylinder. For example, 1.42 x 50 = 71. The weight of the honey in the graduated cylinder is 71 g.
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