how does the heat get transferd from a hot water bag to someones injured back
??

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Solution

As our body or injured person's body is at lower temperature than temperature of the hot water bag, so heat will transfer from hotter body to colder body according to Calorimetry principle.

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how does the heat get transferd from a hot water bag to someones injured back??

As our body or injured person's body is at lower temperature than temperature of the hot water bag, so heat will transfer from hotter body to colder body according to Calorimetry principle.

how does the heat get transferd from a hot water bag to someones injured back
??