DENSITY 7.P.2B.2 Use mathematical and computational thinking to describe the relationship between the mass, volume, and density of a given substance.

Density the mass of a substance per unit of volume

It changes with the substance’s phase change (solids, liquids, and gases) because of the difference in the particle arrangement in each phase. volume & density of a substance depends on its phase or state of matter. Density

Particle arrangements of

Density composition of a substance does not change when one measures mass and volume. Physical property

Mass It is measured in grams (g) Using basic mathematical computations Triple beam balance Mass

Volume It is measured in milliliters (mL) Using basic mathematical computations Liquid displacement method – graduated cylinder

4 lines for each 50 mL

Each line is 10 mL

9 lines for each 50 mL

Each line is 5 mL

9 lines for each 100 mL

Each line is 10 mL

STEPS FOR WATER DISPLACEMENT METHOD Record the initial measurement on the cylinder. Insert the object(s) into the cylinder. Record the final measurement on the cylinder. Final measurement – initial measurement = volume (mL)