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Density
Lab # 3
Name:
_________________________________________
Date:___________________________
Partner(s): _____________________
Problem:
Determine the density of a portion of a willow stem.
Hypothesis:
___________________________________________
_____________________________________________________
Procedure:
The procedure will be similar to the process for calculating
the density of an irregular shaped object. There are different
types of densities that can be calculated for trees. For
additional information of the types ask the instructor for
the "detailed willow density sheet". During this
activity you will be calculating the "Basic Density"
for the willow stem.
This
is completed by taking the mass of the willow twig after
it has been oven dried. The stems provided in your kit will
be oven-dried stems. Please seal the bag carefully after
removing the stems so that it is as air tight as possible.
To get the accurate mass reading simply take a stem and
using the triple beam balance determine the mass to the
nearest tenth of a gram. Record the dry mass.
Once
the dried mass of the twig is determined and recorded, soak
the stem in water overnight. Be sure that the stem is submerged
and will remain completely submerged.
To
complete the volume measurement, take the stem from the
water remove all the excess water with a paper towel. Prepare
a graduated cylinder with water so that when the stem is
place into the cylinder it will be covered by water. Record
the amount of water displacement (same as lab #1).
Calculate
density:
Data
Collection:
The
mass of the oven dried stem (Leave bark on the stem) ____________________________________________________________
The volume of water in the graduated cylinder before submerging
the stem _______________________________________________________
The
volume of water in the graduated cylinder after submerging
the stem _______________________________________________________
Volume
of the stem: ____________________________
Density
formula = ______________________________
Density
of the willow stem = ___________________________________
Optional
area: Calculate the density of another type of stem: cherry,
oak, another type of willow clone, maple etc. Compare the
outcome
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