Physics
Burns caused by steam are much severe than those caused by boiling water because

Temperature of steam is higher
Steam pierces through the pores of body quickly
Steam is gas and engulfs the body quickly
Steam has latent heat

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.
the pressure inside is less than the pressure outside.

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