Chemistry
Spirit in contact with body gives cool sensation because it is :

Liquid
A good conductor
Highly volatile
Transparent

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol react chemically
The flame is too hot for water to cool it down
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Water and petrol are miscible with each other

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