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  4. The water equivalent of 20 g of aluminium (specific heat 0.2 cal a -1 ° C -1 ). is

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Q. The water equivalent of $20\, g$ of aluminium (specific heat $0.2$ cal $a ^{-1}{ }^{\circ} C ^{-1}$ ). is

Thermal Properties of Matter

Solution:

$0.2 \times 20=4$
[Thermal Capacity]
Water equivalent numerically equal to thermal capacity
So $W=4 \,g$