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

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

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Physics
The blue colour of sky is due to

Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight

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