Author: Joseph Dixon
Last saved by: j.dixon
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Density 1

Fine wires are found to have the following dimensions:

Wire

Mass(g)

Length (cm)

estimated uncertainty
in length (+ or -)

Diameter
(mm)

estimated uncertainty in diameter(+ or -)

A | 0.12 | 4.3 | 0.1 | 0.71 | 0.01
B | 0.75 | 7.8 | 0.1 | 0.55 | 0.02
C | 0.31 | 13.4 | 0.1 | 1.12 | 0.02

What is the uncertainty on the mass measurement _______________

Calculate the percentage uncertainty in the measured lengths of the wires:

A__________________________________________________________________

____________________________________________________________________

B___________________________________________________________________

____________________________________________________________________

C__________________________________________________________________

____________________________________________________________________

Calculate the percentage uncertainties in the diameters of each wire

A__________________________________________________________________

____________________________________________________________________

B___________________________________________________________________

____________________________________________________________________

C__________________________________________________________________

____________________________________________________________________

Calculate the density of each of the wires showing your working and calculate the percentage uncertainty in your results.

Density of A__________________________________________________________________

____________________________________________________________________

____________________________________________________________________

Percentage uncertainty A _______________________________________________

Density of

B___________________________________________________________________

____________________________________________________________________

____________________________________________________________________

Percentage Uncertainty B _______________________________________________

Density of
C__________________________________________________________________

____________________________________________________________________

_____________________________________________________________________

Percentage Uncertainty C ________________________________________________

2. In a practical examination you are given
 a sample of the liquid ethanol.
 an uncalibrated cylindrical container  2.1cm in diameter
 a metre rule
 a top pan balance measuring to 0.01g.

You are asked to find the density of the liquid at room temperature as precisely as possible.

Describe how you would do this with the aid of diagrams.. Explain carefully the measurements you would make and precautions you would take to ensure accuracy.
What would be the major source of error in your procedure?