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Key QuestionsCan you create a stack of liquids?
How do you find the density of a liquid?
Does the density of a liquid change as its temperature changes?
Overview Calculate the Density of various fluids
Construct Density column
Use a density column to predict the density of a solid
What is Density? Ratio of mass to volume-mass/vol.
Usually decreases as temperature increases
Water is a notable exception – it takes up less space in its liquid form than in its solid form; result – Ice (solid water) floats in liquid water
Measuring Density Calculate mass per unit volume for
each of the sample liquids
Record the density of each liquid
Rank the liquids according to density
Creating a Density Column A stack of liquids
Can you make one with your sample liquids?
What order would be best when pouring them into the cylinder?
Using a Density Column How can we use the stack
of liquids to estimate the density of objects?
Drop objects in cylinder and observe – Make Predictions First
How can we use this information?
Observations The object sinks all the way to the
bottom of the stack
The object floats on top of the stack
The object is suspended somewhere in the middle of the stack, between 2 layers
How did your predictions stack up?
Predicting Density The rubber stopper is suspended at the
border between glycerin and water
Its density must be less than that of glycerin and greater than that of water
.99 g/ml < density of the rubber stopper < 1.21 g/ml