Due to the limited number of materials, we will be exploring these systems as a class.
Description of object | Var | Copper pipe | Steel pipe | PVC pipe |
---|---|---|---|---|
The initial length of the pipe | Li | __________ | __________ | __________ |
The initial temperature of the pipe | ti | __________ | __________ | __________ |
The final temperature of the pipe | tf | __________ | __________ | __________ |
Calculated change in temperature | tf - ti | __________ | __________ | __________ |
The degrees of rotation of the dial | q | __________° | __________° | __________° |
The diameter of the pin | d | 0.00065 m | 0.00065 m | 0.00065 m |
Calculated change in length | DL | __________ | __________ | __________ |
Calculated coeficient of linear expansion | a | __________ | __________ | __________ |
Calculated error in a | ea | __________ | __________ |
p = 3.141592
DL = (p × d)(q/360°)
The coeficient of linear expansion a can be determined from
the formula for linear expansion:
DL = a Li Dt
DL = a Li [tf
- ti]
a = DL/(Li[tf
- ti])
Use the following table to calculate your percentage error ea:
material | a/°C) | material | a/°C) |
---|---|---|---|
aluminum | 24 ×10-6 | glass, pyrex | 3.6 ×10-6 |
brass | 19 ×10-6 | iron | 12 ×10-6 |
concrete | 12 ×10-6 | lead | 29 ×10-6 |
copper | 17 ×10-6 | quartz | 0.5 ×10-6 |
glass, crown | 9 ×10-6 | steel | 12 ×10-6 |
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