Lab D_ Linear Expansion Coefficent.docx - Lab D Linear...

Lab D: Linear Expansion Coefficient
Name: Tomasz Dulian
Experiment Date: 2/13/19 Submission Date: 2/20/19
PHYS 103A Professor Huang
Group: Dipen, Hrushi, Leandro, Diego, Matthew
1) Introduction:
1.1) Objective:
To measure the coefficient of linear expansion for different metal rods.
1.2) Theoretical Background:
Linear dimensions for most substances increase as the temperature increases in
a range that does not produce a change of phase. Added heat increases
vibrational kinetic energy, which in turn increases the distance between the
atoms
Δ L / L
❑
= α ⋅ ΔT
( L
F
− L
i
)/ L
0
= α ⋅ ( T
F
− T
i
)
Δ L = C hange ∈ Lengt h α = co efficient of linear expansion
2) Experimental Procedure:
3) Results:

3.1) Experimental Data:
Steel Rod →
L
0
= 604 mm
Copper Rod →
L
0
= 600 mm
Rod Material Initial Temperature
T
i
( ) ℃
Final Temperature
T
f
( ) ℃
Temperature Change
ΔT = T
f
− T
i
( ) ℃
Steel 23 98 75
Copper 28 98 70
Rod Material Initial Reading
L
i
(mm)
Final Reading
L
f
(mm)
Length Change
L
( ¿¿
f − L
i
)
ΔL = ¿
(mm)
Steel
1.0 ∗ 10
0
1.48 ∗ 10
0
4.8 ∗ 10
− 1
Copper
5.0 ∗ 10
0
5.67 ∗ 10
0
6.7 ∗ 10
− 1
3.2) Calculations:
Steel
( L
f
− L
i
)/ L
0
= α
Al
⋅ ( T
f
−