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Name two substances which contract on he...

Name two substances which contract on heating.

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**Step-by-Step Solution:** 1. **Understanding Thermal Expansion and Contraction:** - Most substances expand when heated and contract when cooled. However, some substances exhibit unusual behavior where they contract upon heating within certain temperature ranges. 2. **Identifying Substances that Contract on Heating:** - The first substance is **water**. Water has a unique property where it contracts when heated from 0 degrees Celsius to 4 degrees Celsius. This is an exception to the general rule of thermal expansion. - The second substance is **silver iodide**. Silver iodide contracts when heated from 80 degrees Celsius to 141 degrees Celsius. 3. **Conclusion:** - Therefore, the two substances that contract on heating are **water** and **silver iodide**. ---
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