State the method by which heat is transferred :
from a man's hand when placed on a cold iron vessel.

Explanation

**Step-by-Step Solution:**

1. **Identify the Scenario**: A man's hand is placed on a cold iron vessel. The hand is warmer than the iron vessel.

2. **Understand Temperature Difference**: Since the temperature of the man's hand is greater than that of the cold iron vessel, heat will naturally flow from the warmer object (the hand) to the cooler object (the iron vessel).

3. **Determine the Mode of Heat Transfer**: The method by which heat is transferred in this situation is conduction.

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