Coefficient of Thermal Expansion ($C_k$):

For temperatures below 53 °C:

$$C_k = 0.0002403 \times T$$

For temperatures equal to or above 53 °C:

$$C_k = 0.0003364 \times T$$

Where:

• $C_k$ is the coefficient of thermal expansion.
• $T$ is the temperature in degrees Celsius (°C).