Question

Why is water used in hot water bags and not other type of liquid?

• A. Water has highest specific heat compared to other liquids
• B. Hot water bags has highest specific heat compared to other materials
• C. Other liquids has highest specific heat compared to water
• D. None

Answer 1

The correct option is A Water has highest specific heat compared to other liquids

The specific heat is defined as the amount of heat required to change the temperature of unit mass of substance through $1^{o}C$ . Water has highest specific heat compared to other liquids , therefore water gives out largest amount of heat for a fixed temperature change , as compared to other liquids i.e. it cools down slowly than any other liquid .Hence used in hot water bags so that bag remains hot for a long time .