High-precision metre scales, pendulum rods, and surveying tapes are frequently manufactured from "In — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Invar is a highly specialized transition metal alloy renowned for its unique property of having a coefficient of thermal expansion close to zero, meaning it does not significantly expand or contract with temperature changes. It is fundamentally composed of Iron ($Fe$) and Nickel ($Ni$), typically in a ratio of around $64\%$ Iron to $36\%$ Nickel, making it ideal for precision measuring instruments.