Physics
Steam at 100°C causes more severe burns than water at 100°C because

Water has latent heat of fusion
Water has no specific heat capacity
Steam has no specific heat capacity
Steam has latent heat of vaporisation

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Physics
Rainbow is due to

absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets

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