WBJEE 2025 Physics and Chemistry Papers

Let β be the true volume-expansion coefficient of the liquid, A the linear coefficient of copper, and let B be the linear coefficient of silver. Then the vessel's volume-expansion coefficients are 3A (copper) and 3B (silver), and the apparent expansions are
C=β−3A,‌‌S=β−3B.
Eliminating β,
So the linear coefficient of expansion of silver is ‌

C+3A−S

3

.