Q: Is fire extinguished more effectively by hot water or cold water ?
Sol: Fire is extinguished by the vaporation of water which lowers the temperature of the burning body . Further the water vapour envelops the body , keeping oxygen away . Hot water evaporates more than cold water as it is closer to its boiling point , that is hot water is more volatile than cold water . The latent heat of evaporation being large , hot water will extinguish a fire more effectively than cold water .