1. Density DEF: amount of mass in a certain volume. Density is a physical property. Solids have the highest density. Gases have the lowest density. The density of a substance is the same, regardless of the sample size.

2. VariableUnits D = density liquids/gases – g/ml solids – g/cm 3 m = massg V = volume liquids/gases - ml solids - cm 3 Formula: d = m / V m dV

3. Floating VS Sinking Less dense objects float. More dense objects sink. Water’s density is 1g/mL.  Objects density < 1 will float in water  Objects density > 1 will sink. in water

4. Questions: Which state of matter has the highest density? What units would you use? Which state of matter has the lowest density? What units would you use? Which has a greater density, 5 mL of water or 10 mL of water?

5. Viscosity DEF: Resistance to flow High viscosity slow moving Examples: cold syrup molasses cold magma Low viscosity fast moving Examples: water dish soap hot magma

6. Practice What does viscosity of a liquid describe? Which has a higher viscosity, molasses or water? Which has a higher viscosity, hot maple syrup or cold maple syrup? Would a liquid with high viscosity flow faster or slower?