At equal heat applied to both iron and water, the iron with smaller specific heat capacity will experience a more rapid temperature change.
The heat capacity of a substance is the amount of heat required to raise the temperature of entire mass of a substance.
Q = mcΔθ
where;
specific heat capacity of iron = 462 J/kgK
specific heat capacity of water = 4200 J/kgK
Δθ = Q/mc
Change in temperature is inversely proportional to specific heat capacity.
Thus, at equal heat applied to both iron and water, the iron with smaller specific heat capacity will experience a more rapid temperature change.
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