Tkinter Viscosidad del Agua

En esta ocasión se trae la Viscosidad del Agua, la interfaz cuenta con 4 correlaciones que  permiten la obtención de Mw, A continuación se muestra el código completo:
 
import math as math
from tkinter import *
import tkinter as tk
from tkinter import ttk
import numpy as np
from tkinter import messagebox
 
Ventana = Tk()
Ventana.geometry("300x300")
Ventana.maxsize(300,300)
Ventana.minsize(300,300)
Ventana.title("Viscosidad del Agua")
Ventana.configure(background="gray80",highlightbackground="gray80",highlightcolor="black")
 
Recuadro_Entradas = tk.LabelFrame(Ventana)
Recuadro_Entradas.place(relx=0.01, rely=0.01, relheight=0.40, relwidth=0.980)
Recuadro_Entradas.configure(relief='groove',foreground="black",text='''Entradas''',background="gray80",highlightbackground="gray80",highlightcolor="black",width=330)
 
Mensaje_1 = tk.Message(Recuadro_Entradas)
Mensaje_1.place(relx=0.01, rely=0.05, height=25, width=50)
Mensaje_1.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''P''')
Mensaje_2 = tk.Message(Recuadro_Entradas)
Mensaje_2.place(relx=0.01, rely=0.38, height=25, width=50)
Mensaje_2.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''T''')
Mensaje_3 = tk.Message(Recuadro_Entradas)
Mensaje_3.place(relx=0.01, rely=0.71, height=25, width=50)
Mensaje_3.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''S''')
 
Entrada_1 = tk.Entry(Recuadro_Entradas)
Entrada_1.place(relx=0.2, rely=0.05, height=20, width=80)
Entrada_1.configure(background="white",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center')
Entrada_2 = tk.Entry(Recuadro_Entradas)
Entrada_2.place(relx=0.2, rely=0.39, height=20, width=80)
Entrada_2.configure(background="white",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center')
Entrada_3 = tk.Entry(Recuadro_Entradas)
Entrada_3.place(relx=0.2, rely=0.72, height=20, width=80)
Entrada_3.configure(background="white",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center')
 
Entrada_1.delete(0,tk.END);Entrada_1.insert(tk.END,"");Entrada_1.insert(tk.END,0.00)
Entrada_2.delete(0,tk.END);Entrada_2.insert(tk.END,"");Entrada_2.insert(tk.END,0.00)
Entrada_3.delete(0,tk.END);Entrada_3.insert(tk.END,"");Entrada_3.insert(tk.END,0.00)
 
Recuadro_Correlaciones = tk.LabelFrame(Ventana)
Recuadro_Correlaciones.place(relx=0.01, rely=0.44, relheight=0.20, relwidth=0.980)
Recuadro_Correlaciones.configure(relief='groove',foreground="black",text='''Correlaciones Disponibles''',background="gray80",highlightbackground="gray80",highlightcolor="black",width=330)
 
Valores = ["Van Wingen, N.", "Matthews, C.S. y Russel, D.G.","McCain, W.D., Jr.","McCoy, R.L."]
 
Variable = tk.StringVar()
Visor_correlaciones = ttk.Combobox(Recuadro_Correlaciones)
Visor_correlaciones.place(relx=0.02, rely=0.40, height=25, width=280, bordermode='ignore')
Visor_correlaciones.configure(takefocus="",state="readonly",textvariable = Variable, justify = "center",values = Valores)
Visor_correlaciones.current(0)
 
def Correlaciones_Cw(event):
 
            try:
 
                        """S = 20000/10000 # ppm
                                   P = 5000 # psi
                                   T = 200 #°F
                        """
                       
                        P = float(Entrada_1.get()) # psi
                        T = float(Entrada_2.get()) # °S
                        S = float(Entrada_3.get()) # psi
 
                        if P <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Presión es incorrecta")
 
                        elif T <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Temperatura es incorrecta")
 
                        elif S <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Salinidad es incorrecta")
 
                        else:
 
                                   S = S/10000
 
                                   if str(Variable.get()) == Valores[0]:
 
                                               # Correlación de Van Wingen, N.
 
                                               Mw1 = np.exp(1.003-1.479*(10**-2)*T+1.982*(10**-5)*(T**2))
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Mw1)
 
                                   elif str(Variable.get()) == Valores[1]:
 
                                               # Correlación de Matthews, C.S. y Russel, D.G.
 
                                               A = -0.04518+0.009313*S-0.000393*(S**2)
                                               B = 70.634+0.09576*(S**2)
 
                                               Mw2 = A+(B/T)
 
                                               f = 1+(3.5*(10**-12))*(P**2)*(T-40)
 
                                               Mw2 = Mw2*f
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Mw2)
 
                                   elif str(Variable.get()) == Valores[2]:
 
                                               # Correlación de McCain, W.D., Jr.
 
                                               A = 109.574-8.40564*S+0.313314*(S**2)+8.72213*(10**-3)*(S**3)
                                               B = -1.12166+2.63951*(10**-2)*S-6.79461*(10**-4)*(S**2)-5.47119*(10**-5)*(S**3)+1.55586*(10**-6)*(S**4)
 
                                               Mw1 = A*T**B
 
                                               Mw3 = (0.9994+4.0295*(10**-5)*P+3.1062*(10**-9)*(P**2))*Mw1
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Mw3)
 
                                   elif str(Variable.get()) == Valores[3]:
 
                                               # Correlación de McCoy, R.L.
 
                                               Mwp = 0.02414*(10**(247.8/(((5/9)*T+255.37)-140)))
 
                                               Mw = 1-1.87*(10**-3)*(S**0.5)+2.18*(10**-4)*(S**2.5)+(((T**0.5)-1.35*(10**-2)*T)*(2.76*(10**-3)*S-3.44*(10**-4)*(S**1.5)))
 
                                               Mw4 = Mw*Mwp
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Mw4)
 
                                   else:
 
                                               print("Error al realizar la selección de la opción")
           
            except ZeroDivisionError:
 
                        messagebox.showwarning("Advertencia!","Los datos ingresados son incorrectos, por favor revisalos")
 
            except SyntaxError:
 
                        messagebox.showwarning("Advertencia!","Los datos ingresados son incorrectos, por favor revisalos")
 
            except ValueError:
 
                        messagebox.showwarning("Advertencia!","Los datos ingresados son incorrectos, por favor revisalos")
 
            finally:
 
                        pass
 
            return
 
Visor_correlaciones.bind('<<ComboboxSelected>>', Correlaciones_Cw)
 
Recuadro_Salidas = tk.LabelFrame(Ventana)
Recuadro_Salidas.place(relx=0.01, rely=0.67, relheight=0.20, relwidth=0.980)
Recuadro_Salidas.configure(relief='groove',foreground="black",text='''Salidas''',background="gray80",highlightbackground="gray80",highlightcolor="black",width=330)
 
Mensaje_4 = tk.Label(Recuadro_Salidas)
Mensaje_4.place(relx=0.10, rely=0.20, height=25, width=80)
Mensaje_4.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='left',text='''Mw''')
Mensaje_9 = tk.Label(Recuadro_Salidas)
Mensaje_9.place(relx = 0.69, rely = 0.20, height=25, width=50)
Mensaje_9.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''cp''')
Salida_1 = tk.Entry(Recuadro_Salidas)
Salida_1.place(relx=0.35, rely=0.21, height=20, width=80)
Salida_1.configure(background="white",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center')
 
Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,"");Salida_1.insert(tk.END,0.00)
 
def Limpiando():
 
            Entrada_1.delete(0,tk.END);Entrada_1.insert(tk.END,"");Entrada_1.insert(tk.END,0.00)
            Entrada_2.delete(0,tk.END);Entrada_2.insert(tk.END,"");Entrada_2.insert(tk.END,0.00)
            Entrada_3.delete(0,tk.END);Entrada_3.insert(tk.END,"");Entrada_3.insert(tk.END,0.00)
            Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,"");Salida_1.insert(tk.END,0.00)
 
            return
 
Limpieza = Button(Ventana,activebackground="OliveDrab4",activeforeground="black",background="gray80",disabledforeground="#a3a3a3",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",pady="0",text='''Limpieza''', command = Limpiando).place(relx = 0.01, rely = 0.89, height=27, width=293)
 
Ventana.mainloop()
 
El código devuelve lo siguiente: