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Entropy Change at Constant Pressure Formula

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Entropy change constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Check FAQs

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

δs_pres - Entropy Change Constant Pressure?C_p - Heat Capacity Constant Pressure?T₂ - Temperature of Surface 2?T₁ - Temperature of Surface 1?P₂ - Pressure 2?P₁ - Pressure 1?[R] - Universal gas constant?

Entropy Change at Constant Pressure Example

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Here is how the Entropy Change at Constant Pressure equation looks like with Values.

Here is how the Entropy Change at Constant Pressure equation looks like with Units.

Here is how the Entropy Change at Constant Pressure equation looks like.

396.4722 = 1001 \cdot \ln (\frac{151}{101}) - 8.3145 \cdot \ln (\frac{5.2}{2.5})

396.4722J/kg*K = 1001J/(kg*K) \cdot \ln (\frac{151K}{101K}) - 8.3145 \cdot \ln (\frac{5.2Bar}{2.5Bar})

396.4722 = 1001 \cdot \ln (\frac{151}{101}) - 8.3145 \cdot \ln (\frac{5.2}{2.5})

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Entropy Change at Constant Pressure Solution

Follow our step by step solution on how to calculate Entropy Change at Constant Pressure?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

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

Next Step Substitute values of Constants

∴

δs pres = 1001J/(kg*K) \cdot \ln (\frac{151K}{101K}) - 8.3145 \cdot \ln (\frac{5.2Bar}{2.5Bar})

Next Step Convert Units

∴

δs pres = 1001J/(kg*K) \cdot \ln (\frac{151K}{101K}) - 8.3145 \cdot \ln (\frac{520000Pa}{250000Pa})

Next Step Prepare to Evaluate

∴

δs pres = 1001 \cdot \ln (\frac{151}{101}) - 8.3145 \cdot \ln (\frac{520000}{250000})

Next Step Evaluate

∴

δs pres = 396.472233818624J/kg*K

LAST Step Rounding Answer

∴

δs pres = 396.4722J/kg*K

Entropy Change at Constant Pressure Formula Elements

Variables

Constants

Functions

Entropy Change Constant Pressure

Entropy change constant pressure is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.

Symbol: δs_pres

Measurement: Specific EntropyUnit: J/kg*K

Note: Value can be positive or negative.

Formulas to find Entropy Change Constant Pressure

Heat Capacity Constant Pressure

Heat capacity constant pressure is the amount of heat energy absorbed/released per unit mass of a substance where the pressure does not change.

Symbol: C_p

Measurement: Specific Heat CapacityUnit: J/(kg*K)

Note: Value should be greater than 0.

Formulas to find Heat Capacity Constant Pressure

Temperature of Surface 2

Temperature of Surface 2 is the temperature of the 2nd surface.

Symbol: T₂

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Temperature of Surface 2

Temperature of Surface 1

Temperature of Surface 1 is the temperature of the 1st surface.

Symbol: T₁

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Temperature of Surface 1

Pressure 2

Pressure 2 is the pressure at give point 2.

Symbol: P₂

Measurement: PressureUnit: Bar

Note: Value can be positive or negative.

Formulas to find Pressure 2

Pressure 1

Pressure 1 is the pressure at give point 1.

Symbol: P₁

Measurement: PressureUnit: Bar

Note: Value can be positive or negative.

Formulas to find Pressure 1

Universal gas constant

Universal gas constant is a fundamental physical constant that appears in the ideal gas law, relating the pressure, volume, and temperature of an ideal gas.

Symbol: [R]

Value: 8.31446261815324

The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function.

Syntax: ln(Number)

Other formulas in Entropy Generation category

Go Entropy Balance Equation

δs = Gsys - Gsurr + TEG

Go Entropy Change at Constant Volume

δs vol = C v \cdot \ln (\frac{T 2}{T 1}) + [R] \cdot \ln (\frac{ν 2}{ν 1})

Go Entropy Change Variable Specific Heat

δs = s2 ° - s1 ° - [R] \cdot \ln (\frac{P 2}{P 1})

Go Entropy using Helmholtz Free Energy

S = \frac{U - A}{T}

How to Evaluate Entropy Change at Constant Pressure?

Entropy Change at Constant Pressure evaluator 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 evaluate 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 evaluate Entropy Change at Constant Pressure using this online evaluator? To use this online evaluator 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.

FAQs on Entropy Change at Constant Pressure

What is the formula to find Entropy Change at Constant Pressure?

The formula of Entropy Change at Constant Pressure is expressed as Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1). Here is an example- 396.4722 = 1001*ln(151/101)-[R]*ln(520000/250000).

How to calculate Entropy Change at Constant Pressure?

With Heat Capacity Constant Pressure (C_p), Temperature of Surface 2 (T₂), Temperature of Surface 1 (T₁), Pressure 2 (P₂) & Pressure 1 (P₁) we can find Entropy Change at Constant Pressure using the formula - Entropy Change Constant Pressure = Heat Capacity Constant Pressure*ln(Temperature of Surface 2/Temperature of Surface 1)-[R]*ln(Pressure 2/Pressure 1). This formula also uses Universal gas constant and Natural Logarithm (ln) function(s).

Can the Entropy Change at Constant Pressure be negative?

Yes, the Entropy Change at Constant Pressure, measured in Specific Entropy can be negative.

Which unit is used to measure Entropy Change at Constant Pressure?

Entropy Change at Constant Pressure is usually measured using the Joule per Kilogram K[J/kg*K] for Specific Entropy. Calorie per Gram per Celcius[J/kg*K], Joule per Kilogram per Celcius[J/kg*K], Kilojoule per Kilogram per Celcius[J/kg*K] are the few other units in which Entropy Change at Constant Pressure can be measured.

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Entropy Change at Constant Pressure Formula

Entropy Change at Constant Pressure Example

Entropy Change at Constant Pressure Solution

Entropy Change at Constant Pressure Formula Elements

Other formulas in Entropy Generation category

How to Evaluate Entropy Change at Constant Pressure?

FAQs on Entropy Change at Constant Pressure

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