Question

Why our tongue is stick in to cold iron pillar

Answer 1

The pole absorbs the heat quite readily, literally sucking the warmth from your tongue faster than your body can supply it. The saliva on your tongue then freezes (provided it is below freezing), with the resulting ice latching onto the flagpole and your very porous tongue. You are stuck.

Here's why: Heat is sort of a socialist. ... So when you stick your tongue to that metal pole, assuming it's cold enough that the pole is well below freezing, the heat from your tongue is sapped by the metal before your body can replenish it. The water in your tongue freezes, and there you are, stuck like fool