PHSC 1001 Experiment #2 Measurement
CHM 1025C Experiment #3 Measurement Data Sheet
Name: __________________ Section: ____________ Instructor_______________
Length: (You may work in pairs)
With Meter Stick:
Person#1
Height in Inches: _____________in Height in Centimeters: _______________cm
Person#2
Height in Inches: _____________in Height in Centimeters: _______________cm
Calculation:
#1:___________cm = 1 inch #2:___________cm = 1 inch (two meter)
Accepted Value: 2.5356 cm = 1 in
#1 Deviation from Correct: __________ cm #2 Deviation from Correct: _________cm
% Error : Deviation/Accepted Value X 100 = #1___________% #2__________%
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With Two Meter Stick:
Height in Inches: _____________in Height in Centimeters: _______________cm
Calculation:
___________cm = 1 inch Accepted Value: 2.5356 cm = 1 in
Deviation from Correct: __________ cm
% Error : Deviation/Accepted Value X 100 = ___________________%
Volume from Length:
Object: _________________________(description)
Length: __________cm Width: __________cm Height: ___________cm
Volume = length x width x height. V = _______ cm3
Length: __________in Width: __________in Height: ___________in
Volume = length x width x height. V = = ________ in3
Calculation: _____________ cm3 = 1.000 in3
The correct value is 16.48 cm3 = 1.000 in3
Deviation: ____________ cm3 % Error = ____________%
Mass (Large object-beyond capacity of top loader)
Capacity of Triple Bean Balance: _______________g
Mass of Object = __________g (triple beam) (Car keys-cell phone)
Mass of Object = __________oz (some ounce measuring device, if available)
__________g = 1.00 oz (The true value is 1 oz. = 28.35 g. )
Calculate the deviation and percent error.
Mass (Smaller object within capacity of Deak Top Loader)
(or other similar objects) (use the top loader Balances):
Capacity of Desk Top Loading Balance: _______________g
1st pre1980 penny: _____________g 1st post 1980 Penny: ________________g
2nd pre 1980 penny: _____________g 2nd post 1980 Penny: ________________g
3rd pre 1980 Penny: _____________g 3rd post 1980 Penny: ________________g
Total Mass: __________________g Total Mass: ____________________g
Average pre1980: ______________g Average post 1980: _________________g
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Finding the True Value:
If available from your instructor, find the mass of a pre 1962 penny (Wheat penny) and a 1943 penny (Zinc Penny) using four different balances:
Balance Wheat Penny Zinc Penny
Triple Beam ____________g ____________g
Top Loader (0.01g) ____________g ____________g
Top Loader (0.001g) ____________g ____________g
(only one in the lab at the front desk)
Analytical Balance ____________g ____________g
(only one in the lab at the front desk)
Discussion: Precision vs Accuracy vs Uncertainty:
Volume:
10 mL Graduated Cylinder:
_________drops = 1 mL
_________drops = 5 mL Calculate: _____drops = 1 mL ( # in 5/5)
_________drops = 10 mL Calculate: _____drop = 1 mL (# in 10/10)
Accepted Value : 20 drops = 1 mL
Discussion: Was their variation between three above measurements?
What can you say about accuracy versus precision?
250 or 500 mL Cylinder
1st Measurement: _________mL = 16/20 oz water bottle (Fill to the marked line)
2nd Measurement: _________mL
3rd Measurement: _________mL
Average: _________mL
Calculation:
___________mL = 1 ounce
Accepted value Calculation (946 mL = 1 qt ; 32 oz = 1 qt)
___________mL = 1 ounce
___________% error
Comments about Precision & Accuracy:
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Discussion: Precision versus Accuracy of Length and Mass Above:
Count (Optional)
Your instructor will give you the Data Page for the Bean Jar Experiment, if time permits
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