Fill the catalyst required to fill two of the bottle neck way round butt installed thermometers to prevent evaporation of the trial so as not to result in error.
The addition of a catalyst to fill the bottom of a bottle neck for the second round. The thermometers are installed to prevent evaporation of the trial so as not to result in a crash.
Adding catalyst need to fill the neck of the second round bottom flask. The installation of thermometer to prevent evaporation of the substances used to from the crash.