--- src/calculator/gasCalculator.cpp.orig	2018-10-24 05:36:48 UTC

+++ src/calculator/gasCalculator.cpp

@@ -139,7 +139,7 @@ void gasCalculator::calculatePressure()

     double temp = m_temp.convertTo( KUnitConversion::Kelvin ).number();

     double b = m_Vand_b.convertTo( KUnitConversion::Liter ).number();

-    double pressure = m_moles * R * temp / (volume - m_moles * b) - m_moles * m_moles * m_Vand_a / volume / volume;

+    double pressure = m_moles * Rgas * temp / (volume - m_moles * b) - m_moles * m_moles * m_Vand_a / volume / volume;

     m_pressure = Value(pressure, KUnitConversion::Atmosphere );

     m_pressure = m_pressure.convertTo(getCurrentUnitId(ui.pressure_unit));

@@ -154,7 +154,7 @@ void gasCalculator::calculateMolarMass()

     double temp = m_temp.convertTo(KUnitConversion::Kelvin).number();

     double b = m_Vand_b.convertTo(KUnitConversion::Liter).number();

-    m_molarMass = mass * R * temp / (pressure + m_moles * m_moles * m_Vand_a / volume / volume)\

+    m_molarMass = mass * Rgas * temp / (pressure + m_moles * m_moles * m_Vand_a / volume / volume)\

                   / (volume - m_moles * b);

     ui.molarMass->setValue(m_molarMass);

 }

@@ -165,7 +165,7 @@ void gasCalculator::calculateVol()

     double temp = m_temp.convertTo(KUnitConversion::Kelvin).number();

     double b = m_Vand_b.convertTo(KUnitConversion::Liter).number();

-    double volume = m_moles * R * temp / pressure + (m_moles * b);

+    double volume = m_moles * Rgas * temp / pressure + (m_moles * b);

     m_vol = Value(volume, KUnitConversion::Liter);

     m_vol = m_vol.convertTo( getCurrentUnitId(ui.volume_unit) );

     ui.volume->setValue(m_vol.number());

@@ -178,7 +178,7 @@ void gasCalculator::calculateTemp()

     double b = m_Vand_b.convertTo(KUnitConversion::Liter).number();

     double temp = (pressure + (m_moles * m_moles * m_Vand_a / volume / volume))\

-                  * (volume - m_moles * b) / m_moles / R;

+                  * (volume - m_moles * b) / m_moles / Rgas;

     m_temp = Value(temp, KUnitConversion::Kelvin);

     m_temp = m_temp.convertTo( getCurrentUnitId( ui.temp_unit ) );

     ui.temp->setValue(m_temp.number());

@@ -192,7 +192,7 @@ void gasCalculator::calculateMoles()

     double b = m_Vand_b.convertTo(KUnitConversion::Liter).number();

     m_moles = (pressure + m_moles * m_moles * m_Vand_a / volume / volume)\

-              * (volume - m_moles * b) / R / temp;

+              * (volume - m_moles * b) / Rgas / temp;

     ui.moles->setValue(m_moles);

 }

@@ -204,7 +204,7 @@ void gasCalculator::calculateMass()

     double b = m_Vand_b.convertTo(KUnitConversion::Liter).number();

     double mass = (pressure + m_moles * m_moles * m_Vand_a / volume / volume)\

-                  * (volume - m_moles * b) * m_molarMass / R / temp;

+                  * (volume - m_moles * b) * m_molarMass / Rgas / temp;

     m_mass = Value(mass, KUnitConversion::Gram);

     m_mass = m_mass.convertTo( getCurrentUnitId( ui.mass_unit ) );

     ui.mass->setValue(m_mass.number());

--- src/calculator/gasCalculator.h.orig	2018-10-24 05:31:16 UTC

+++ src/calculator/gasCalculator.h

@@ -28,7 +28,7 @@

 #include "ui_gasCalculator.h"

 // The universal Gas constant is defined here.

-#define R 0.08206

+#define Rgas 0.08206

 using namespace KUnitConversion;