Entropy Change at Constant Pressure Calculator

✖Heat capacity constant pressure is the amount of heat energy absorbed/released per unit mass of a substance where the pressure does not change.ⓘ Heat Capacity Constant Pressure [C_p]			+10% -10%
✖Temperature of Surface 2 is the temperature of the 2nd surface.ⓘ Temperature of Surface 2 [T₂]			+10% -10%
✖Temperature of Surface 1 is the temperature of the 1st surface.ⓘ Temperature of Surface 1 [T₁]			+10% -10%
✖Pressure 2 is the pressure at give point 2.ⓘ Pressure 2 [P₂]			+10% -10%
✖Pressure 1 is the pressure at give point 1.ⓘ Pressure 1 [P₁]			+10% -10%

✖Entropy change constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.ⓘ Entropy Change at Constant Pressure [δs_pres]

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Formula

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Entropy Change at Constant Pressure

Formula

δs pres = C p \cdot \ln (\frac{T 2}{T 1}) - [R] \cdot \ln (\frac{P 2}{P 1})

Example

396.4722 J/kg*K = 1001 J/(kg*K) \cdot \ln (\frac{151 K}{101 K}) - [R] \cdot \ln (\frac{5.2 Bar}{2.5 Bar})

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Entropy Change at Constant Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1)
δs_pres = C_p*ln(T₂/T₁)-[R]*ln(P₂/P₁)
This formula uses 1 Constants, 1 Functions, 6 Variables

Constants Used

[R] - Universal gas constant Value Taken As 8.31446261815324

Functions Used

ln - The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function., ln(Number)

Variables Used

Entropy Change Constant Pressure - (Measured in Joule per Kilogram K) - Entropy change constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.
Heat Capacity Constant Pressure - (Measured in Joule per Kilogram per K) - Heat capacity constant pressure is the amount of heat energy absorbed/released per unit mass of a substance where the pressure does not change.
Temperature of Surface 2 - (Measured in Kelvin) - Temperature of Surface 2 is the temperature of the 2nd surface.
Temperature of Surface 1 - (Measured in Kelvin) - Temperature of Surface 1 is the temperature of the 1st surface.
Pressure 2 - (Measured in Pascal) - Pressure 2 is the pressure at give point 2.
Pressure 1 - (Measured in Pascal) - Pressure 1 is the pressure at give point 1.

STEP 1: Convert Input(s) to Base Unit

Heat Capacity Constant Pressure: 1001 Joule per Kilogram per K --> 1001 Joule per Kilogram per K No Conversion Required
Temperature of Surface 2: 151 Kelvin --> 151 Kelvin No Conversion Required
Temperature of Surface 1: 101 Kelvin --> 101 Kelvin No Conversion Required
Pressure 2: 5.2 Bar --> 520000 Pascal (Check conversion here)
Pressure 1: 2.5 Bar --> 250000 Pascal (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

δs_pres = C_p*ln(T₂/T₁)-[R]*ln(P₂/P₁) --> 1001*ln(151/101)-[R]*ln(520000/250000)

Evaluating ... ...

δs_pres = 396.472233818624

STEP 3: Convert Result to Output's Unit

396.472233818624 Joule per Kilogram K --> No Conversion Required

FINAL ANSWER

396.472233818624 ≈ 396.4722 Joule per Kilogram K <-- Entropy Change Constant Pressure

(Calculation completed in 00.004 seconds)

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Created by Suman Ray Pramanik

Indian Institute of Technology (IIT), Kanpur

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< Entropy Generation Calculators

Entropy Change at Constant Volume

Go Entropy Change Constant Volume = Heat Capacity Constant Volume*ln(Temperature of Surface 2/Temperature of Surface 1)+[R]*ln(Specific Volume at Point 2/Specific Volume at Point 1)

Entropy Change at Constant Pressure

Go Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1)

Entropy Change Variable Specific Heat

Go Entropy Change Variable Specific Heat = Standard molar entropy at point 2-Standard molar entropy at point 1-[R]*ln(Pressure 2/Pressure 1)

Entropy Balance Equation

Go Entropy Change Variable Specific Heat = Entropy of System-Entropy of Surrounding+Total Entropy Generation

Entropy Change at Constant Pressure Formula

Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1)
δs_pres = C_p*ln(T₂/T₁)-[R]*ln(P₂/P₁)

What is Entropy change at constant volume?

Entropy change constant volume is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. It is a state function and hence depends on the path taken by the system. Entropy is a measure of randomness.

How to Calculate Entropy Change at Constant Pressure?

Entropy Change at Constant Pressure calculator uses Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1) to calculate the Entropy Change Constant Pressure, Entropy change at constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Entropy Change Constant Pressure is denoted by δs_pres symbol.

How to calculate Entropy Change at Constant Pressure using this online calculator? To use this online calculator for Entropy Change at Constant Pressure, enter Heat Capacity Constant Pressure (C_p), Temperature of Surface 2 (T₂), Temperature of Surface 1 (T₁), Pressure 2 (P₂) & Pressure 1 (P₁) and hit the calculate button. Here is how the Entropy Change at Constant Pressure calculation can be explained with given input values -> 396.4722 = 1001*ln(151/101)-[R]*ln(520000/250000).

FAQ

What is Entropy Change at Constant Pressure?

Entropy change at constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work and is represented as δs_pres = C_p*ln(T₂/T₁)-[R]*ln(P₂/P₁) or Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1). Heat capacity constant pressure is the amount of heat energy absorbed/released per unit mass of a substance where the pressure does not change, Temperature of Surface 2 is the temperature of the 2nd surface, Temperature of Surface 1 is the temperature of the 1st surface, Pressure 2 is the pressure at give point 2 & Pressure 1 is the pressure at give point 1.

How to calculate Entropy Change at Constant Pressure?

Entropy change at constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work is calculated using Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1). To calculate Entropy Change at Constant Pressure, you need Heat Capacity Constant Pressure (C_p), Temperature of Surface 2 (T₂), Temperature of Surface 1 (T₁), Pressure 2 (P₂) & Pressure 1 (P₁). With our tool, you need to enter the respective value for Heat Capacity Constant Pressure, Temperature of Surface 2, Temperature of Surface 1, Pressure 2 & Pressure 1 and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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