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RecoveringMoron

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and introducing (and displacing) into this container a parcel of 30F air of volume Y (which is less than the volume of X)...

Is there any way to determine how much time it would take the 30F degree air Y to warm to 50F?

Thanks much. Just trying to think about if buried air tubes to collect mean Earth temperature might be useful for a project. Thanks much for any help.