Physics · Mechanics · Density

Density of an irregular solid

Measure the mass of the object on a balance. Note the water level in a measuring cylinder, lower the object in, and read the new water level. Volume = (new − old) cm³. Density = mass ÷ volume — and that number identifies the material.

m = 81.0 g

Calculation

ρ = m ÷ V

Mass measured on a balance; volume by displacement.

Exam-style questions

1. Why is WATER-DISPLACEMENT used for an IRREGULAR solid?

2. How is DENSITY calculated?

3. If a solid FLOATS, can you still use this method?

4. Why must the meniscus be read at the BOTTOM of the curve at eye level?