What precaution should be observed measuring temperature with a laboratory thermometer?
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it should be observed that the mercury inside it coincides zero mark
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Precautions Taken While Reading a Thermometer - definition
Thermometer should be washed before and after use, preferably with an antiseptic solution.
Ensure that before use the mercury level is below 350C.
Handle the thermometer with care. ...
Dont hold the thermometer by the bulb while reading it.
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