if two scales of different material (let say steel and aluminium)are same at 20 degree does it mean that it will be same at 0 degree celcius?

fro the concept of thermal expansion; 
We know that
so, the changed or final length depends on
1. What material you choose
2. What is the initial length of each material
3. Change is temperature. 

So as the temperature change is same for aluminum and steel, depending on their initial lengths, the final length will be same.

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