• Thermometer A is placed into hot water, at 81.0 °C, for two minutes and then removed.
• A student records, in Table 1.1, the temperature θ of the thermometer bulb every 30 s.
• Thermometer B is placed into hot water, also at 81.0 °C, for two minutes.
• The student removes thermometer B from the water and quickly wraps a layer of dry
cotton wool insulation around the bulb.
• He then records the temperature θ of the thermometer bulb every 30 s.
Complete the column headings and time column in Table 1.1.
Table 1.1
|
thermometer A
with wet insulation
|
thermometer B
with dry insulation
|
time/
|
q /
|
q /
|
0
|
80.0
|
77.5
|
|
75.0
|
70.5
|
|
67.0
|
64.0
|
|
59.5
|
59.0
|
|
53.5
|
54.5
|
|
48.0
|
50.5
|
|
43.0
|
47.5
|