Which extinguishing agent has a greater heat-absorbing capacity than most common extinguishing agents?

Which extinguishing agent has a greater heat-absorbing capacity than most common extinguishing agents?

• A. Foam
• B. Dry chemical
• C. Water
• D. CO2

Answer: (C)

Water’s cooling power is unmatched because of its high heat-absorbing capacity, thanks to a high specific heat and a large latent heat of vaporization. It takes a lot of energy to raise the temperature of liquid water, and once it heats to boiling, turning into steam requires even more energy. That energy absorption cools the fuel and surroundings rapidly, starving the fire of heat and helping to stop the flame. Other common extinguishing agents don’t store as much heat: dry chemical powders work by interrupting chemical reactions, CO2 mainly displaces oxygen, and foam relies on water and film formation but doesn’t beat pure water’s heat-absorption efficiency.

Water’s cooling power is unmatched because of its high heat-absorbing capacity, thanks to a high specific heat and a large latent heat of vaporization. It takes a lot of energy to raise the temperature of liquid water, and once it heats to boiling, turning into steam requires even more energy. That energy absorption cools the fuel and surroundings rapidly, starving the fire of heat and helping to stop the flame. Other common extinguishing agents don’t store as much heat: dry chemical powders work by interrupting chemical reactions, CO2 mainly displaces oxygen, and foam relies on water and film formation but doesn’t beat pure water’s heat-absorption efficiency.