If the clock is held at a constant 0.0ºc over a period of 24 hours, how much longer or shorter does the clock measure compared to a perfect clock?

If the clock is held at a constant 0.0ºc over a period of 24 hours, the clock will be exactly the same as the perfect clock because  it is at a constant 0.0 ºc for 24. Meaning there is no deviation on its reading

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