Question

why are we advised not to hold the thermometer by its bulb while reading??​

Answer 1

Answer:

Because the reading will go wrong as the temperature of our fingers will be recorded in the thermometer.

Answer 2

Answer:

It is advised not to hold the thermometer by its bulb while reading the temperature because the level of Mercury increases due to our body temperature and effect the actual reading. Always hold a thermometer from its top end and read the level of Mercury.