# Exercise 3.23 from math import log, pi def egg(M, T0=20, Ty=70): rho = 1.038 K = 5.4e-3 c = 3.7 Tw = 100 t = M**(2.0/3) * c * rho**(1.0/3) / (K * pi**2 * ((4*pi)/3)**(2.0/3)) * log(0.76*(T0-Tw)/(Ty-Tw)) return t # For a soft boiled egg, the yolk temperature (Ty) should not exceed 70, # while for a hard boiled egg, the yolk temperature should be allowed to # reach 70. This is according to Exercise 1.12 on page 46. So how should # we set Ty? Here we use Ty=65 for soft boiled egg and Ty=80 for hard # boiled egg. # Soft boiled, small, from fridge: print(egg(47, T0=4, Ty=65))/60 # Soft boiled, large, from fridge: print(egg(67, T0=4, Ty=65))/60 # Soft boiled, small, from hot room: print(egg(47, T0=25, Ty=65))/60 # Soft boiled, large, from hot room: print(egg(67, T0=25, Ty=65))/60 # Hard boiled, small, from fridge: print(egg(47, T0=4, Ty=80))/60 # Hard boiled, large, from fridge: print(egg(67, T0=4, Ty=80))/60 # Hard boiled, small, from hot room: print(egg(47, T0=25, Ty=80))/60 # Hard boiled, large, from hot room: print(egg(67, T0=25, Ty=80))/60