Physics
A large bucket of water at 40 °C and a small cup of water at 80 °C are kept on a table. Which of them has higher heat content ?
- The cup of water.
- The bucket of water.
- Both of them have an equal heat content.
- Cannot be said without knowing the mass of the water in each.
Calorimetry
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Answer
Cannot be said without knowing the mass of the water in each.
Reason — Heat content depends on the amount of heat energy, which is given by
Q = mcΔt
where
- m is mass,
- c is specific heat capacity, and
- Δt is the change in temperature.
Although the cup has a higher temperature, the bucket may contain a much larger mass of water. Since heat content depends on both mass and temperature, we cannot determine which has more heat without knowing the mass of water in each.
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