Density

density

density of a substance tells you how much mass is packed into a particular volume

density = mass over volume

units

units of density = units of mass over units of volume = grams over cm cubed = g cm -3

kilogram over metre cubed = kg m -3

triangle mass over density x volume

find mass - density x volume

find density = mass over volume

find volume = mass over density

Activities

flotation

a solid will float in a liquid if the solid is less dense than the liquid

a liquid will float on top of another liquid if the liquid on top is less dense

boats float because filled with air making it less dense than water

To measure density of rectangular block

put block on scale and read mass, use ruler to measure height, width, and length to get volume, use mass over volume

to measure density of irregular solid

measure mass on scale, put object in overflow can full of water, let water overflow into graduated cylinder check volume, mass over volume

to measure density of a liquid

put liquid in graduated cylinder on a scale, use mass over volume