Question

which substance has the highest specific heat capacity

Answer 1

Hello dear !
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The specific heat of any substance  is defined as the  amount of heat needed to  change the temperature of 1g of substance by 1° C
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The natural substance with the highest specific heat capacity is liquid ammonia, with a specific heat of 4.7 J/g K.
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Answer 2

Hydrogen has the highest specific heat capacity of 14630J/kg.K