R Under development (unstable) (2025-07-25 r88451 ucrt) -- "Unsuffered Consequences"
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> library(chapensk)
Loading required package: Bessel
> 
> CH4 <- Gas("methane")
> Ar <- Gas("argon")
> # virial coefficient
> stopifnot(round(1E6 * CH4$B(T = 300), 0) == -41)
> # viscosity
> stopifnot(round(1E6 * CH4$viscosity(T = 300), 1) == 11.2)
> # density
> stopifnot(round(CH4$density(T = 300), 3) == 0.652)
> # diffusion coefficient
> stopifnot(round(1E4 * CH4$diffusion(T = 300), 3) == 0.199)
> # thermal conductivity
> stopifnot(round(Ar$thermal_conductivity(T = 300), 3) == 0.018)
> # polar molecule
> HCl <- Gas("hydrogen chloride")
> HCl$viscosity(T = 300)
> 
> proc.time()
   user  system elapsed 
   0.79    0.15    0.93