All substances extend with increasing temperature. Therefore it is necessary to agree on a standard temperature a calibration is conducted at. This has been set to 20 deg C because it is close to room temperature and therefore easy to maintain.
Why 20 C temperature is needed f calibration of dimension measuring instruments? State the standard(s).?
that IS the standard.
20 C at 1 atm is and always will be the standard.
Reply:For almost all solids, if the temperature increases, the substance will grow due to thermal effects. If the temperature cools, the substance will shrink.
By specifying a certain temperature for a calibration of an instrument, the manufacturers are attempting to reduce the amount of variation in the instrument.
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