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

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

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere

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