2.  Science Objective › We know that the weight of an object is equal to the sum of the weight of its parts.

3. Unit of measure: Tools Unit of measure: Tools

4.  Set Purpose › We are going to read about how we measure matter. › We are going to find out the properties we measure and the tools we use for measuring them.

5.  Quick SUMMARY › Mass is the amount of matter an object has. › We measure mass with a balance. › An object's mass is the same everywhere, but its weight may be different. › We measure volume by measuring the amount of space that an object occupies.

6.  Questions › What tool do we use to measure the mass of an object? › Could you measure the volume of a feather by placing it in a measuring cup of water? Why or why not? › Is the measurement of the mass or weight of a carrot be affected if you cut the carrot into pieces?

7.  Science Objective › We will determine the physical properties of matter using metric measurements that incorporate tools such as rulers, thermometers, balances.

8.  Quick SUMMARY › Density is a measure of the amount of matter (mass) in a certain amount of space (volume). › One way to study density is by observing buoyancy.

9.  Questions › What do we mean by density? › If an object floats in water, what does that tell you about its density? › What two properties do you need to measure in order to determine the density of an object?