# Charles' Law

## Charles' Law

• Submitted By: tommy698
• Date Submitted: 09/10/2014 7:32 AM
• Category: Science
• Words: 1253
• Page: 6

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Physics

Thermodynamics

Investigating the relationship between the length of a column of air and its temperature in Celsius and by doing so find a value for Absolute Zero

Question

Investigate the relationship between the length of a column of air and its temperature in Celsius and by doing so find a value for Absolute Zero.

Variables

Independent Variable
Dependent Variable

Temperature in °C:

1. 21°C
2. 31°C
3. 41°C
4. 51°C
5. 61°C
6. 71°C
7. 81°C

Length of column in mm

Controls

Ambient Pressure – 1 Atm

Mass of air

Humidity of air – Zero humidity

Width of column – 2mm diameter

Apparatus

Capillary tube of air with Sulphuric Acid Index
Metal Ruler
Elastic Band
250ml beaker
Stirrer
Bunsen Burner
Gauze
Tripod

Method

1. Mount the tube carefully on a metal ruler and place in a 250ml beaker of water.
2. Record the initial water temperature and read off the length of the air column.
3. Heat the water until the temperature raises by 10°C and record the new length.
4. Continue until you have 7 readings.
5. Slowly replace the water with room temperature water being careful to avoid thermal shock for the glassware.
6. Repeat the readings three times.

Results

Temperature/°C
21
31
41
51
61
71
81
Length of the air column/mm
Test 1
42
45
47
50
51
54
58

Test 2
43
45
47
49
51
54
59

Test 3
43
44
46
49
51
55
60

Processed Data

Temperature/°C
Average/mm
ΔT = ± 1mm
21
43
31
45
41
47
51
49
61
51
71
54
81
59

Average = (Sum of the Values) / (Number of the test)
= (47 + 47 + 46) / 3
= (140)/3
= 47

The uncertainty of the processed data is 1°C since the biggest difference in a given set of results was 2°C (60 – 58). Hence...