Tkinter Relación Gas Disuelto-Agua Rsw

Continuando con la creación de interfaces gráficas, se trae en esta ocasión la relación gas disuelto-agua, la interfaz cuenta con 2 correlaciones que  permiten la obtención de Rsw, 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("300x200")
Ventana.maxsize(300,200)
Ventana.minsize(300,200)
Ventana.title("Tensión Interfacial del Petróleo")
Ventana.configure(background="gray80",highlightbackground="gray80",highlightcolor="black")
 
Recuadro_Entradas = tk.LabelFrame(Ventana)
Recuadro_Entradas.place(relx=0.01, rely=0.01, relheight=0.980, relwidth=0.980)
Recuadro_Entradas.configure(relief='groove',foreground="black",text='''Entradas''',background="gray80",highlightbackground="gray80",highlightcolor="black",width=330)
 
Valores = ["Culberson, O.L y McKetta, J.J., Jr.","McCoy, R.L"]
 
Variable = tk.StringVar()
Visor_correlaciones = ttk.Combobox(Recuadro_Entradas)
Visor_correlaciones.place(relx=0.02, rely=0.12, height=25, width=280, bordermode='ignore')
Visor_correlaciones.configure(takefocus="",state="readonly",textvariable = Variable, justify = "center",values = Valores)
Visor_correlaciones.current(0)
 
def Correlaciones_RSW(event):
 
            try:
 
                        # S = 20000/10000 # ppm
                        # P = 5000 # psi
                        # T = 200 # °F
 
                        S = float(Entrada_1.get()) # psi
                        P = float(Entrada_2.get()) # °F
                        T = float(Entrada_3.get()) # °S  
 
                        if P <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Salinidad es incorrecta")
 
                        elif T <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Presión es incorrecta")
 
                        elif S <= 0:
 
                                   messagebox.showwarning("Advertencia!","La Temperatura es incorrecta")
 
                        else:
 
                                   S = S/10000
 
                                   if str(Variable.get()) == Valores[0]:
 
                                               # Correlación de Culberson, O.L y McKetta, J.J., Jr.
 
                                               A = 8.15839-(6.12265*(10**(-2) )*T)+(1.91663*(10**(-4) )*(T**2 ))-(2.1654*(10**(-7) )*(T**3 ))
                                               B = (1.01021*(10**(-2) ))-(7.44241*(10**(-5) )*T)+(3.05553*(10**(-7) )*(T**2 ))-(2.94883*(10**(-10) )*(T**3 ))
                                               C = (-9.02505+(0.130237*T)-(8.53425*(10**(-4) )*(T**2 ))+(2.34122*(10**(-6) )*(T**3 ))-(2.37049*(10**(-9) )*(T**4 )))*(10**(-7) )
 
                                               Rswp = A+B*P+C*P**2
 
                                               # Corrección por salinidad dentro de los rangos 0<Salinidad(%)<30 y 70<Temperatura(°F)<250
 
                                               Rsw = (10**(-0.0840655*S*(T**-0.285854)))*Rswp
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Rsw)
 
                                   elif str(Variable.get()) == Valores[1]:
 
                                               # Correlación de McCoy, R.L
 
                                                A = 2.12+3.45*(10**-3)*T-3.59*(10**-5)*(T**2)
                                               B = 0.0107-5.26*(10**-5)*T+1.48*(10**-7)*(T**2)
                                               C = -8.75*(10**-7)+3.9*(10**-9)*T-1.02*(10**-11)*(T**2)
 
                                               Rswp= A+B*P+C*P**2
 
                                               #
 
                                               Rsw = (1-(0.0753-(1.73*10**-4)*T)*S)*Rswp
 
                                               Salida_1.delete(0,tk.END);Salida_1.insert(tk.END,Rsw)
 
                                   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_RSW)
 
Mensaje_1 = tk.Message(Recuadro_Entradas)
Mensaje_1.place(relx=0.01, rely=0.20, height=25, width=50)
Mensaje_1.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''S''')
Mensaje_2 = tk.Message(Recuadro_Entradas)
Mensaje_2.place(relx=0.01, rely=0.40, height=25, width=50)
Mensaje_2.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''P''')
Mensaje_3 = tk.Message(Recuadro_Entradas)
Mensaje_3.place(relx=0.01, rely=0.60, height=25, width=50)
Mensaje_3.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''T''')
 
Mensaje_4 = tk.Label(Recuadro_Entradas)
Mensaje_4.place(relx=0.45, rely=0.20, height=25, width=80)
Mensaje_4.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='left',text='''RSW''')
Mensaje_9 = tk.Label(Recuadro_Entradas)
Mensaje_9.place(relx = 0.75, rely = 0.35, height=25, width=50)
Mensaje_9.configure(background="gray80",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center',text='''PCN/BN''')
 
Entrada_1 = tk.Entry(Recuadro_Entradas)
Entrada_1.place(relx=0.2, rely=0.21, 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=0.41, 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=0.61, height=20, width=80)
Entrada_3.configure(background="white",foreground="#000000",highlightbackground="#d9d9d9",highlightcolor="black",justify='center')
Salida_1 = tk.Entry(Recuadro_Entradas)
Salida_1.place(relx=0.7, rely=0.21, height=20, width=80)
Salida_1.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)
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(Recuadro_Entradas,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 = 0.80, height=25, width=280)
 
Ventana.mainloop()
 
El código devuelve lo siguiente: