By simply adding a chemical wetting agent called aerosol to water, we reduce both surface and interfacial tension. In fire fighting, wet water will penetrate into a burning cotton bale and extinguish the fire.
Do firemen use wetter water?
Firefighters add a ‘wetting agent’ to make their water even wetter.
What is the benefit of using wetting agents in fire fighting?
Wetting agents simply improve the efficiency of water in extinguishing Class A fuel fires. Water to which a wetting agent has been added is sometimes referred to as “wet water” because of its increased ability to wet surfaces to which it is applied.
How can I make my water more wet?
Water becomes “wetter” by lowering its surface tension. The surface tension of water is a force that defines its behavior. This can be viewed by filling a glass over the rim with water, or by placing drops of water on a hard surface.
Does salt make water wetter?
Lowering the surface tension makes water “wetter” by decreasing its resistance to compression. … The conclusion can be drawn that sodium lowers the surface tension of water while calcium and magnesium ions increase the surface tension.
What does AFFF foam stand for?
Aqueous film forming foam (AFFF, or alcohol resistant AR-AFFF) is a highly effective foam used for fighting high-hazard flammable liquid fires. AFFF is usually created by combining foaming agents with fluorinated surfactants.
How does a wetting agent work?
Wetting agents are like detergents. They overcome that waxing coating and allow water to penetrate into the pore spaces between,” Peter said. “Most potting mixes, if they become dry, will also become water repellent,” he said.
Is Class A foam a wetting agent?
Although class A foam contains wetting agents that reduce the surface tension of the contained water, it should not be confused with the wetting agents which are used exclusively for improving the penetration of water into deep-seated fires in class A fuels.
Is Afff Class A or B?
Class B Foam Concentrates are ideal for suppressing fires involving petroleum-based products, LNG, rubber, and flammable and combustible liquids; such as diesel fuel, crude oil gasoline and ethanol.