  The thermodynamic relations in the Tsallis statistics were studied with
physical quantities. An additive entropic variable related to the Tsallis
entropy was introduced by assuming the form of the first law of the
thermodynamics. The fluctuations in the Tsallis statistics were derived with
physical quantities with the help of the introduced entropic variable. It was
shown that the mean squares of the fluctuations of the physical quantities in
the Tsallis statistics are the same as those in the conventional statistics.
The mean square of the fluctuation of the Tsallis entropy and the mean square
of the fluctuation of the Tsallis temperature were also derived. The mean
square of the relative fluctuation of the Tsallis entropy and the mean square
of the relative fluctuation of the Tsallis temperature are represented with
heat capacities. It was shown that these fluctuations of the Tsallis quantities
have the $q$-dependent terms in the Tsallis statistics of the entropic
parameter $q$.
