Question

nowadays we use digital thermometers . why

Answer 1

Because the older thermometer where having mercury and it may be harmful to us and it there in front of thermometer. If it broken so very danger so nowday there is digital thermometer.

Answer 2

There is a lot of concern over the use of mercury in thermometers. Mercury is a toxic substance and is very difficult to dispose of if a thermometer breaks. These days, digital thermometers are available which do not use mercury.