Why she dips the thermometer in a liquid before use?

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Answer

Reason for Dipping Thermometer in Liquid Before Use:

Ensuring Accuracy:

By dipping the thermometer in a liquid before use, it helps in ensuring the accuracy of the temperature reading.
The liquid used is typically either lukewarm water or rubbing alcohol, which helps calibrate the thermometer to the correct temperature.

Resetting the Thermometer:

Dipping the thermometer in a liquid helps reset the mercury or digital reading to the starting position before taking a new temperature reading.
This ensures that the thermometer is ready for an accurate measurement without any residual temperature from previous uses affecting the current reading.

Preventing Contamination:

By dipping the thermometer in a liquid before use, it helps in preventing contamination.
Any germs or bacteria present on the thermometer are washed away by the liquid, reducing the risk of spreading infections.

Improving Safety:

Dipping the thermometer in a liquid before use also helps in improving safety.
It ensures that the thermometer is clean and free from any residue that could potentially cause harm or inaccuracies in temperature readings.