The next step is calculating the gas viscosity at the given conditions, which are 180°F and 10,000 psi. In order to do this, we need to calculate the pseudocritical pressure and temperature. Since there is no information available about the pressure and temperature, an alternative way to calculate the pseudocritical pressure and temperature is by using the specific gravity of the gas according to Eqs. (1.32) and (1.34):