#5.1.1a
thermal equilibrium
#5.1.1b
absolute scale of temperature (i.e. the thermodynamic scale) that does not depend on property of any particular substance
#5.1.1c
temperature measurements both in degrees Celsius (°C) and in kelvin (K)
#5.1.1d
\(T(K) ≈ θ (°C) + 273 \)