const GAS_CONSTANT_SI = 8.31446261815324 # Exact since May20, 2019; https://en.wikipedia.org/wiki/Gas_constant
const PA_IN_BAR = 1e5               # Сколько паскалей в баре
const BOLTZMANN_SI = 1.380649e-23 # Exact since May 20, 2019; https://en.wikipedia.org/wiki/Boltzmann_constant 