Question

Why is water used in hot water bags and no other types of liquid?
(A) Water has highest specific heat compared to other liquids
(B) Hot water bags have highest specific heat compared to other materials
(C) Other liquids have highest specific heat compared to water
(D) None

Answer 1

Hint: We know that water is used in hot water bags. No other types of liquid are used in it. We will see that since water has the highest specific heat compared to other liquids, this is the reason no other liquid is used in such bags.

Complete step by step answer:
Specific heat capacity: it is the amount of heat required by a body of unit atomic mass to raise its temperature by 1Kelvin.
Only water is a liquid which has a capacity to absorb heat before temperature is increased. Water is formed by bonding two hydrogen and one oxygen molecule. On the absorption of heat these bonds are broken whereas when heat is released then molecules start moving freely.
Water is the only substance which can exist in all three states that is solid, liquid and gas. Because of its unique behavior it shows different characteristics also.

Therefore, option (A) is correct.

Note:
If hot water bags already had the highest specific heat then we can use any kind of liquid, but it does not happen. So, option (B) is wrong.
Since we no other liquid showed behavior to that of water which was because of its highest specific heat. Thus, option (C) is also wrong. But this similar statement proves that option (A) is right. Hence (D) is also not possible.