Why does a metal rod expand more than a glass rod for the same temperature increase?
Metals have a higher coefficient of linear expansion (αl) than glass (Section 10.5, Table 10.1). For the same ΔT, ΔL = L0αlΔT is greater for metals due to their larger αl.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
