Fill in the following blanks with suitable words :
In solids, heat is transferred by __________

Explanation

To fill in the blank in the statement "In solids, heat is transferred by __________", we need to identify the method of heat transfer that occurs specifically in solids.

### Step-by-Step Solution:

1. **Understanding Heat Transfer**: Heat can be transferred in three main ways: conduction, convection, and radiation. However, the question specifically asks about solids.

2. **Identifying the Relevant Method**:
- **Conduction**: This is the process where heat is transferred through direct contact of particles. In solids, the particles are closely packed, allowing them to transfer heat efficiently through vibrations and collisions.
...