🔍 Key Concepts

• Heat transfer: conduction, convection, and latent heat of vaporization • How different extinguishing agents remove heat vs. smother flame • Surface coverage and contact time of each agent on a hot metal bulkhead

💭 Think About

• Which agent can stay in contact with the metal surface the longest and carry away the most heat? • Which form of water (stream vs. fog/spray vs. steam) is best at absorbing heat from a hot solid surface? • Do dry chemical agents mainly cool the surface, or do they primarily interrupt the chemical chain reaction of the fire?

✅ Before You Answer

• Compare the heat-absorbing capacity of water in liquid form vs. steam and dry chemical • Think about which choice would have the greatest mass and flow rate actually reaching and washing over the bulkhead • Consider whether the agent will be blown away or dispersed before it can transfer much heat to the metal