Question

I was absent for a lab and my professor told me to do "some research" to find answers to fill in for this data chart...If anyone knows some typical in general answers for these you would be a massive help...

L(mm), R(ohms) room temp, Change of L(mm), R(ohms) hot

find these values for copper, steel, and aluminum then calculate

T (celsius) room, T (celsius) hot, and change of T

for Copper, steel, and aluminum...

The title of this lab is measuring the coefficient of linear expansion for copper, steel and aluminum.

Answer 1

The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure.

Linear expansion[edit]

Change in length of a rod due to thermal expansion.

we may write:

1 dL L dr

where is a particular length measurement and is the rate of change of that linear dimension per unit change in temperature.

The change in the linear dimension can be estimated to be:

$\frac{\Delta L}{L} = \alpha_L\Delta T$

see this above formula. you will get reading of change of L in mm ( delta L) also you know the Length, L .

delta T is T_hot - T_room

using all these readings, you can estimate alpha, the coefficient of linear expansion

for coppor, it is 17 x 10^-6 K^-1

^{for steel it is} 12 x 10^-6 K^-1

for aluminium it is23.1 x 10-6  K-1

Comment if you have any doubt. and please rate my answer!

Answer 2

I will explain it to you in detail