Discussion
Blisters are formed more rapidly by the steam from boiling water than by boiling water itself because
Answer: A
Because steam carries latent heat.
Steam and boiling water are both at 100 °C, but steam must give up its latent heat of vaporisation - about \(2260\ \mathrm{kJ\,kg^{-1}}\) - as it condenses on the skin, before it even begins to cool. That extra heat is what makes the burn so much worse.
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