Saturation Properties Calculator

Calculator Inputs

Enter saturated liquid and saturated vapor values from a table. The calculator interpolates the mixture properties using the quality value.

Reference Type

Reference Value

Quality x

Liquid Specific Volume v_f

Vapor Specific Volume v_g

Liquid Internal Energy u_f

Vapor Internal Energy u_g

Liquid Enthalpy h_f

Vapor Enthalpy h_g

Liquid Entropy s_f

Vapor Entropy s_g

Reset

Formula Used

This calculator uses linear interpolation for saturated mixtures. Each property is determined from the saturated liquid value, saturated vapor value, and quality.

y = y_f + x(y_g - y_f)

y_fg = y_g - y_f

Where:

y is the final mixture property.
y_f is the saturated liquid property.
y_g is the saturated vapor property.
x is the quality or dryness fraction.
y_fg is the phase-change interval.

How to Use This Calculator

Select a reference basis. Choose temperature or pressure.
Enter the reference value if you want it shown.
Type the quality value between 0 and 1.
Enter the saturated liquid and vapor table values.
Press Calculate Properties to view results.
Read the property table, working steps, and graph.
Use CSV or PDF export for reporting.

Example Data Table

Sample water saturation inputs near 100 °C are shown below. These values demonstrate the interpolation process.

Reference	x	v_f	v_g	h_f	h_g	s_f	s_g	Interpolated h
100 °C	0.25	0.001043	1.694000	419.170000	2675.500000	1.307000	7.354000	983.252500
100 °C	0.50	0.001043	1.694000	419.170000	2675.500000	1.307000	7.354000	1547.335000
100 °C	0.75	0.001043	1.694000	419.170000	2675.500000	1.307000	7.354000	2111.417500

Frequently Asked Questions

1) What does the quality value mean?

Quality is the mass fraction of vapor in a saturated mixture. A value of 0 means saturated liquid. A value of 1 means saturated vapor. Values between them represent wet steam or a wet saturated mixture.

2) Why do I need both liquid and vapor values?

The calculator interpolates between the saturated liquid state and saturated vapor state. It needs both endpoints to determine the interval for specific volume, internal energy, enthalpy, and entropy.

3) Can I use pressure instead of temperature?

Yes. This page accepts either basis as a reference label. You still need the correct saturated liquid and vapor properties taken from the corresponding pressure or temperature row in your chosen table.

4) Does this page include built-in steam tables?

No. This version is table-driven. You enter the saturated property values yourself, then the page performs the interpolation maths and presents the final mixture properties with steps.

5) What happens when x equals 0 or 1?

When x is 0, the mixture becomes saturated liquid, so the result equals the liquid property. When x is 1, the mixture becomes saturated vapor, so the result equals the vapor property.

6) Why must vapor values be larger here?

For common saturated property tables, the vapor-side values entered for these four properties normally exceed the liquid-side values. The validation helps catch swapped entries and reduces interpolation errors in routine practice.

7) What does the Plotly graph show?

The graph shows how one selected property changes as quality moves from 0 to 1. It also marks your current state point, which makes interpolation trends easier to inspect visually.

8) When should I export CSV or PDF?

Use CSV when you want spreadsheet-ready values. Use PDF when you need a clean report or shareable summary containing the current result table, steps, and plotted chart.