Fill in the following blanks with suitable words :
No medium is required for the transfer of heat by the process of ____________

Explanation

To fill in the blank in the statement "No medium is required for the transfer of heat by the process of ____________", we need to identify the correct mode of heat transfer that does not require a medium.

### Step-by-Step Solution:

1. **Identify the Modes of Heat Transfer**:
- There are three primary modes of heat transfer: conduction, convection, and radiation.

2. **Understand Conduction**:
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