const O₂ₐ = 0.209L*L^-1 # Volume of O₂ in the air
const Dₗᵢ = 3.17 # Diffusion coefficient of substrate in liquid phase, dimensionless
const Dₒₐ = 1.67 # Diffusion coefficient of oxygen in air, dimensionless
const pₛₓ = 0.024 # Fraction of soil carbon that is considered soluble
const Eₛ = 10cm # Effective soil septh (assume only 10 first cm produce CO2)
