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avatarSkillfulGrasshopper3789
Secondary IV • 3yr.

Hello! I'm not sure if the Q in Q = m * c * ∆T means the heat or thermal energy?

Also, when is the Q positive and negative?

Thanks in advance :)

Chemistry
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  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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      avatarLaurie Cteacher check
      Team Alloprof • 3yr.

      Hello!


      The variable Q in the formula Q = m * c * ∆T represents the amount of thermal energy stored in a substance.


      A positive Q value means that the substance has absorbed energy, while a negative value indicates that the substance has lost energy.


      The variable Q derives its sign from the temperature variation. If the variation is positive, the substance is absorbing heat. On the other hand, if the variation is negative, then the substance gives off heat.


      I hope that answers your question! Do not hesitate to come back to see us!

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