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Metric Measurements Lab – Advanced Version
Key Concepts:
• The Metric System, also referred to as the International System of Measurement (SI), is
what the scientific community uses to measure data precisely.
• Units of measurement, such as feet, pounds, inches, and miles are part of the English System
of Measurement that we use daily in the United States. These measurements are not part of
the Metric System.
• The Metric System is based on the number 10. Thus, it is quite easy to change one unitinto another because all units are related to one another by powers of 10.
• The three basic units of the Metric System that will be used in this laboratory investigation
are grams (mass), liters (volume), and meters (length).
• Volume generally refers to how much of something (e.g. liquid, gas) a container can hold.
• “Symbol” refers to the abbreviation, or initials, used to denote a specific metric
measurement (mL, cg, dm).
• “Name” refers to the full description of a specific metric measurement (e.g. deciliter,kilogram, nanometer). The first part of the name (deci, kilo, nano) refers to the amount or
size of substance being measured. The second part of the name (liter, gram, meter ) refers to
the basic type of unit based on what is being measured: mass, volume, or length.
Introduction:
In most laboratory investigations where data is collected, precise measurements must be
taken before observations and analysis of the data can be made. In scientific work, as well as
everyday measuring in nearly every country outside of the United States, the Metric System
is used. The Metric System is universal in all fields of science, so even scientists conductingresearch in different parts of the world and don’t speak the same language can understand
each other’s data. In this activity, metric measurements for length, volume, and mass will be
reviewed using common classroom materials. Students will also practice using commonlaboratory equipment, such as metric rulers, meter sticks, and balances.
Materials:
• Meter stick
• Metric ruler
• Small test tubes
• Rubber stoppers (jar lids are a suitable substitute)
• Pennies post-1982 (other coins can be substituted)
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• Balances (triple-beam or digital if available) – suggestions will be given on how to measuremass in this lab if suitable balances cannot be obtained
• 50mL beaker (one for each student group is preferable)
• 100mL graduated cylinders (one for each student group is preferable)
Pre-Lab Questions
1. Why do scientists and other people in most countries use the Metric System for
measurements?
2. Why is it easy to change from one unit to another in the Metric System?
3. Why is it difficult to convert English units of measurements that we use in America, such as
miles to yards or feet?
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4. Name several aspects of everyday life that would change if our country converts to using the
Metric System.
Note: Prior to answering pre-lab questions #5-10, you should receive copies of the “MetricStaircase” tool, or at the very least be able to view an electronic copy of the staircase, for
further assistance.
5. If you have 0.147 Mg, it is equal to _____________________ dg.
6. If you have 1.78692 kL of water, it is equal to _____________________ μL.
7. If you have 3,400,500 μg, it is equal to _________________________Mg.
8. If you have 1,000,000,000 grams, this is the same as having one _________________ (name).
9. The symbol that is equal to 0.1 g is (1)__________________________.
10. If you have 1,876 μg of sugar, it is equal to _________________________mg.
Part 1 – Measuring Length
1. Use meter sticks to measure the length, width, and height of a lab table or desk in the classroom.
Record your measurements to the nearest hundredth of a meter in Data Table #1.
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2. Convert the measurements from meters to centimeters and then to millimeters. Record your
measurements in Data Table #1.
Data Table #1
Lab Table/Desk Measurements
Dimension meter (m) centimeter (cm) millimeter (mm)
Length
Width
Height
3. Use metric rulers to measure the length of a test tube and the diameter of its mouth in
centimeters. Record you measurements to the nearest millimeter in Data Table #2.
4. Convert the measurements from centimeters to millimeters. Record these measurements in DataTable #2.
Data Table #2
Test Tube Measurements
Dimension centimeter (cm) millimeter (mm)
Length
Diameter of Mouth
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Part 2 – Measuring Liquid Volume
1. Fill the small test tube to the top with water. Pour the water into the graduated cylinder.
2. The surface of the liquid will be slightly curved. This curvature is referred to as the meniscus.
The meniscus is created by a property of water called adhesion. When water molecules are
attracted to materials other than water molecules, this phenomenon is called adhesion. Water
molecules are attracted to the molecules that make up the graduated cylinder which cause the
meniscus to form.
3. To measure the volume accurately, your eye must be at the same level as the bottom of the
meniscus. Record the volume of the water from the test tube to the nearest milliliter in Data Table
#3.
http://chemsrvr2.fullerton.edu/HES/volume/volume_files/meniscus.gif
Data Table #3
Measurement of Liquid Volume
Object Volume (mL)
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Water in Test Tube
Part 3 – Measuring Mass
1. Place the 50mL beaker on the measurement tray of a three-beam or digital balance (instructions
will follow below for measuring mass if suitable balances cannot be obtained. If you are using a
triple beam balance, be sure that the riders are moved all the way to the left and that the pointer rests
on zero. If you are using a digital scale, be sure to “tare” the scale so that the screen reads 0.0
grams.
http://www.explorelearning.com/ELContent/gizmos/ELScien ce_Deliverable/ExplorationGuides/images/EL_MSPS_TripBeamBal1.gif
Tare
http://tennesseecandlesupplies.com/images/scales/Primo_Chrome_P115C_Medium.jpg
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2. Move the rider on the middle beam to the right one notch at a time until the pointer drops below
zero. Move the rider left one notch.
3. Move the rider on the back beam one notch at a time until the pointer drops below zero again.
Move the rider left one notch.
4. Slide the rider along the front beam until the pointer stops at zero. The mass of your object is
equal to the sum of the readings on all three beams.
5. Record the mass of the beaker to the nearest tenth of a gram in Data Table #4 and then remove
the beaker from the scale.
6. Repeat steps #2 through #5 using the rubber stopper (or equivalent) and then the coin.
7. Use the graduated cylinder to place exactly 40mL of water in the beaker. Find the combined mass
of the beaker and water. Record the mass to the nearest tenth of a gram in Data Table #4.
Data Table #4
Measurement of Mass
Object Mass (g)
50mL Beaker
Rubber Stopper (or equivalent)
Coin (specify type)
50mL beaker plus 40mL of water
Note: If triple-beam or digital balances cannot be obtained, a rudimentary scale can be
constructed out of a wooden bar with two Ziploc bags (see picture below). When the masses in
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the two baggies are the same, the wooden bar should be horizontal. A useful fact when
calibrating the rudimentary scale: according to the US mint, a post-1982 penny has mass 2.5
grams (www.usmint.gov; date retrieved 7/19/2010).
Concept Questions
1. How do you convert meters to centimeter mathematically? How do you convert
centimeters to decimeters mathematically?
2. What is the largest volume of liquid your graduated cylinder can measure?
3. What is the smallest volume of liquid your graduated cylinder can measure?
4. What is the largest mass of an object your balance can measure (assuming you used a
triple-beam or digital balance)?
http://lpchscience.pbworks.com/Projectile-Lab
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5. What is the smallest mass of an object your balance can measure (assuming you used a
triple-beam or digital balance)?
6. What is the mass of 40mL of water?
7. How would you find the mass of a certain amount of water that you poured into a paper
cup?
8. As part of this investigation, you found the mass of 40mL of water. Based on your
observations, what is the approximate mass of 1mL of water?
9. Extension – If there are more than one type of balance available, use them to find the
masses of several different objects. Compare the accuracy of the different balances. Give a
reasonable, logical explanation if your results vary between different types of balances.
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References:
1. Activity adapted from: Levine, Joseph, S. (2002). Biology: Laboratory Manual A/Laboratory Skills, Pearson Prentice Hall.
2. Cheryl Dudeck, Science Department Chair/Science Teacher, King College Prep High School, 4445 S. Drexel Avenue, Chicago, IL. 60653.
3. Elena F. Koslover, Graduate Research Assistant, Biophysics Program, Stanford University, Stanford, CA. 94305.