In order to perform the experiment, in identifying the
temperature of different kinds of liquid freeze—the needed equipment is the
thermometer. It is because the thermometer is an equipment that helps in
determining a temperature. The variable in the experiment would be the
temperature as this is not consistent for the effects or outcome will likely
change.
Starting in 1908, while a professor at the University of Chicago, Millikan worked on an oil-drop experiment in which he measured the charge on a single electron. J. J. Thomson had already discovered the charge-to-mass ratio of the electron.
Points out that when water freezes