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| calibrated marks (Calibrated marks on the tube allow the temperature to be read by the length of the mercury within the tube, which varies according to the heat given to it. wiki Alexander Demidov) | |||
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| calibrated marks (Calibrated marks on the tube allow the temperature to be read by the length of the mercury within the tube, which varies according to the heat given to it. wiki Alexander Demidov) | |||