Question

while taking reading from the clinical thermometer why should not we touch the bulb ?

Answer 1

We know that bulb of a clinical thermometer have $\bf{mercury}$ inside it.

We also know that Mercury exapnds on heating, since, if earlier temperature is measured and recorded and then if we touch the bulb then the bulb will absorb heat from our hands also.

This results to give irregular temperature measurement.

Answer 2

b)It's important to not touch the sides of the test tube with the thermometer because it might explode from the heat or pressure. c)It's important to not touch the sides of the test tube with the thermometer to ensure the temperature is being measured of the solution, not the glass.