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
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a good conductor of heat as well as electricity
a bad conductor of heat but a good conductor of electricity

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