AFF Exit Exam • Set 4 Question 27 of 30
A definite advantage of using water as a firefighting agent is its characteristic of:
✓
Direct Answer
Option B: Rapid expansion as water absorbs heat and changes to steam
Water's high latent heat of vaporization means it absorbs a significant amount of heat as it turns to steam. This rapid expansion (Option C) helps to cool the burning material and can also help to push flames away from the surface.
All Options
A
Leaving clean residue that acts as a fire barrier
B
Rapid expansion as water absorbs heat and changes to steam
(Correct Answer)
C
Breaking down chemical bonding chains safely
D
Non-conductivity near live machinery
Detailed Explanation & Context
Water's high latent heat of vaporization means it absorbs a significant amount of heat as it turns to steam. This rapid expansion (Option C) helps to cool the burning material and can also help to push flames away from the surface.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).
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