Superheated Steam Table — 25 bar (2.5 MPa)
Specific volume, internal energy, enthalpy, entropy, density and isobaric specific heat of superheated steam at 25 bar (2.5 MPa), computed from IAPWS-IF97 — the same formulation the SimuPipe solver uses. Rows run from the saturation temperature (223.96 °C) to 800 °C in 20 °C steps.
| T (°C) | v (m³/kg) | ρ (kg/m³) | u (kJ/kg) | h (kJ/kg) | s (kJ/kg·K) | cp (kJ/kg·K) |
|---|---|---|---|---|---|---|
| 223.96Sat. | 0.079947 | 12.5082 | 2602.2 | 2802.0 | 6.2560 | 3.4044 |
| 240 | 0.084437 | 11.8431 | 2641.2 | 2852.3 | 6.3555 | 2.9367 |
| 260 | 0.089553 | 11.1666 | 2684.3 | 2908.2 | 6.4624 | 2.6806 |
| 280 | 0.094351 | 10.5987 | 2724.3 | 2960.2 | 6.5581 | 2.5276 |
| 300 | 0.098932 | 10.1079 | 2762.3 | 3009.6 | 6.6460 | 2.4256 |
| 320 | 0.103357 | 9.6752 | 2799.0 | 3057.4 | 6.7279 | 2.3559 |
| 340 | 0.107664 | 9.2881 | 2834.8 | 3104.0 | 6.8052 | 2.3078 |
| 360 | 0.111881 | 8.9381 | 2870.1 | 3149.8 | 6.8787 | 2.2749 |
| 380 | 0.116026 | 8.6187 | 2905.0 | 3195.1 | 6.9491 | 2.2525 |
| 400 | 0.120115 | 8.3254 | 2939.7 | 3240.0 | 7.0168 | 2.2379 |
| 420 | 0.124156 | 8.0544 | 2974.2 | 3284.6 | 7.0822 | 2.2290 |
| 440 | 0.128159 | 7.8028 | 3008.8 | 3329.2 | 7.1455 | 2.2243 |
| 460 | 0.132129 | 7.5683 | 3043.3 | 3373.6 | 7.2070 | 2.2228 |
| 480 | 0.136072 | 7.3491 | 3077.9 | 3418.1 | 7.2668 | 2.2239 |
| 500 | 0.139990 | 7.1434 | 3112.6 | 3462.6 | 7.3251 | 2.2269 |
| 520 | 0.143887 | 6.9499 | 3147.4 | 3507.2 | 7.3821 | 2.2315 |
| 540 | 0.147766 | 6.7675 | 3182.4 | 3551.9 | 7.4377 | 2.2374 |
| 560 | 0.151629 | 6.5951 | 3217.6 | 3596.7 | 7.4922 | 2.2444 |
| 580 | 0.155477 | 6.4318 | 3252.9 | 3641.6 | 7.5455 | 2.2522 |
| 600 | 0.159313 | 6.2769 | 3288.5 | 3686.8 | 7.5978 | 2.2608 |
| 620 | 0.163138 | 6.1298 | 3324.2 | 3732.1 | 7.6491 | 2.2701 |
| 640 | 0.166953 | 5.9897 | 3360.2 | 3777.6 | 7.6995 | 2.2798 |
| 660 | 0.170758 | 5.8562 | 3396.4 | 3823.3 | 7.7490 | 2.2900 |
| 680 | 0.174556 | 5.7288 | 3432.8 | 3869.2 | 7.7976 | 2.3006 |
| 700 | 0.178346 | 5.6071 | 3469.4 | 3915.3 | 7.8455 | 2.3115 |
| 720 | 0.182129 | 5.4906 | 3506.3 | 3961.6 | 7.8927 | 2.3227 |
| 740 | 0.185907 | 5.3790 | 3543.4 | 4008.2 | 7.9391 | 2.3342 |
| 760 | 0.189679 | 5.2721 | 3580.8 | 4055.0 | 7.9848 | 2.3458 |
| 780 | 0.193446 | 5.1694 | 3618.4 | 4102.0 | 8.0299 | 2.3577 |
| 800 | 0.197208 | 5.0708 | 3656.3 | 4149.3 | 8.0744 | 2.3698 |
u is not tabulated independently. Specific internal energy follows from the enthalpy and specific volume as u = h − p·v, with p in MPa and v in m³/kg (1 MPa·m³/kg = 1000 kJ/kg). At 25 bar (2.5 MPa) that pressure term is worth 493.0 kJ/kg at 800 °C, so u and h are far apart at high pressure and nearly equal at low pressure — a common source of error when the wrong column is read.
The first row is saturated vapour, at 223.96 °C. Below that temperature at 25 bar (2.5 MPa) the water is a liquid or a two-phase mixture, and this table does not apply — use the saturated tables instead.
Values are IAPWS-IF97, not interpolated. Every row is evaluated directly from the industrial formulation at that exact temperature, so there is no interpolation error between rows. If you need a temperature between the 20 °C steps, the calculator computes it exactly.