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.

Variable Units

D = densityliquids/gases – g/ml

solids – g/cm3

m = mass g

V = volumeliquids/gases - ml

solids - cm3

Formula: d = m / V m

d V

Floating VS Sinking

Less dense objects float. More dense objects sink.

Water’s density is 1g/mL.Objects density < 1 will float in waterObjects density > 1 will sink. in water

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?

ViscosityDEF: Resistance to flow High viscosity

slow moving

Examples:

cold syrup

molasses

cold magma

Low viscosity fast moving

Examples:

water

dish soap

hot magma

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?