Question

why does steam at 100°C cause burns more than water at the same temperature?

Answer 1

even though the steam has more latent heat hidden in it, the water causes more severe burns. this is so because the water remains in contact with the skin for a longer time than the steam. but the steam has more latent heat of vaporisation

Answer 2

because the boiling point of the water is at 100°C so it starts evaporating at tht point hence the most heated water vapour gets evaporated and has more burns