Lesson Description: These labs are hands on exercises that will allow the students to measure and calculate the densities of different types of objects. The procedure for calculating willow densities will be taught and the students will practice making their own calculations. The importance of density as a concept will also be discussed and how this applies to willow biomass.

Learning Outcomes:
The students will be able to:
- Make accurate measurements in length, mass, and volume to the nearest tenth of a unit
- Calculate the density of a regular and irregular shaped object
- Calculate the dry density of two different clones of willow twigs
- Calculate the density of another type of tree twig
- Explain the importance of density and how it relates to Willow as a biomass fuel source

Materials:
*Lab worksheets *Oven dried Willow stems
*Graduated cylinder *aluminum bar, and aluminum cube
*Metric ruler (or two objects made of the same
*2 to 3 regular shaped object material but different sizes)
*2 irregular shaped objects
*Medium beaker filled with water
*Sink or a basin
*Paper towels
*Several triple beam balances for the class

Method: Follow the directions provided on the lab sheets

Time Requirements:
45 minutes per lab (3 different labs provided)

MST standards: See the overview chart

Assessment: Every student will complete the three labs for the instructor's analysis. This would be a good skill to put in a practice lab practical as well.