Thermal Expansion: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Thermal Expansion. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true as liquids typically have higher coefficients of thermal expansion than solids. Reason (R) is true because weaker intermolecular forces in liquids allow molecules to move more freely and separate further upon heating.

(R) correctly explains (A), as the weaker forces enable greater thermal expansion.