Write the dimensional formul of Thermal stress.

Explanation

To find the dimensional formula of thermal stress, we can follow these steps:

1. **Understand the Concept of Thermal Stress**: Thermal stress is defined as the stress induced in a material due to a change in temperature. Stress is generally defined as force per unit area.

2. **Identify the Formula for Stress**: The formula for stress (σ) is given by:
\[ \sigma = \frac{F}{A} \]
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