  The thermodynamic relations in the Tsallis statistics were discussed with
physical temperature and physical pressure. 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 these fluctuations are related to heat capacities
and compressibilities, as shown in the conventional thermodynamics. The
fluctuation of the Tsallis entropy was also given through the fluctuation of
the entropic variable.
