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SATURATED STEAM
Thermodynamic Properties – Saturated Steam (Values to Nearest Even Digits)
PSIG
0
1
2
3
4
5
6
7
8
9
10
15
20
25
30
35
40
45
50
55
60

°F
212
216
219
222
224
227
230
232
235
237
240
250
259
267
274
281
287
292
298
303
307

Heat of
Liquid*
180
183
187
190
193
195
298
201
203
206
208
218
227
236
243
250
256
262
267
272
277

BTU/lb.
Latent Heat of
Evaporation
970
968
965
964
962
961
959
957
956
954
952
945
940
934
929
924
920
915
912
908
905

Total Heat
of Steam
1150
1151
1152
1154
1155
1156
1157
1158
1159
1160
1160
1163
1167
1170
1172
1174
1176
1177
1179
1180
1182

Spec. Vol.
Ft3/lb
Sat. Vapor
27
25
24
22.5
21.0
20.0
19.5
18.5
18.0
17.0
16.5
14.0
12.0
10.5
9.5
8.5
8.0
7.0
6.7
6.2
5.8

PSIG
65
70
75
80
85
90
95
100
110
120
125
130
140
150
160
170
180
190
200
220
240
250

°F
312
316
320
324
328
331
335
338
344
350
353
356
361
366
371
375
380
384
388
395
403
406

Heat of
Liquid*
282
286
290
294
298
302
306
309
316
322
325
328
334
339
344
348
353
358
362
370
378
381

BTU/lb.
Latent Heat of
Evaporation
901
898
895
892
889
886
883
881
876
871
868
866
861
857
853
849
845
841
837
830
823
820

Total Heat
of Steam
1183
1184
1185
1186
1187
1188
1189
1190
1192
1193
1193
1194
1195
1196
1197
1197
1198
1199
1199
1200
1201
1201

Spec. Vol.
Ft3/lb
Sat. Vapor
5.5
5.2
4.9
4.7
4.4
4.2
4.0
3.9
3.6
3.3
3.2
3.1
2.9
2.7
2.6
2.5
2.3
2.2
2.1
2.0
1.8
1.75

* Heat content is the number of BTU/lb needed to reach the condition indicated starting with water at 32°F.
Saturated steam is pure steam in direct contact with the liquid water
from which it was generated and at a temperature of water at the
existing pressure. For example, saturated steam at 50 PSIG has a
temperature of 298°F.
Pressure is commonly expressed either (a) PSIA – pounds per square
inch absolute or, (b) PSIG – pounds per square inch gauge above

standard atmospheric pressure of 14.7 PSIA, thus PSIG is equal to
PSIA minus 14.7 psi.
Latent heat, expressed in BTU per pound, is the amount of heat
needed (absorbed) to convert a pound of boiling water to a pound of
steam. The same amount of heat is liberated when a pound of steam
condenses back to a pound of water. Latent heat varies with
temperature (see table above).

...
SATURATED STEAM
* Heat content is the number of BTU/lb needed to reach the condition indicated starting with water at 32°F.
Thermodynamic Properties Saturated Steam (Values to Nearest Even Digits)
Saturated steam is pure steam in direct contact with the liquid water
from which it was generated and at a temperature of water at the
existing pressure. For example, saturated steam at 50 PSIG has a
temperature of 298°F.
Pressure is commonly expressed either (a) PSIA pounds per square
inch absolute or, (b) PSIG pounds per square inch gauge above
standard atmospheric pressure of 14.7 PSIA, thus PSIG is equal to
PSIA minus 14.7 psi.
Latent heat, expressed in BTU per pound, is the amount of heat
needed (absorbed) to convert a pound of boiling water to a pound of
steam. The same amount of heat is liberated when a pound of steam
condenses back to a pound of water. Latent heat varies with
temperature (see table above).
BTU/lb. Spec. Vol.
Heat of Latent Heat of Total Heat Ft
3
/lb
PSIG °F Liquid* Evaporation of Steam Sat. Vapor
0 212 180 970 1150 27
1 216 183 968 1151 25
2 219 187 965 1152 24
3 222 190 964 1154 22.5
4 224 193 962 1155 21.0
5 227 195 961 1156 20.0
6 230 298 959 1157 19.5
7 232 201 957 1158 18.5
8 235 203 956 1159 18.0
9 237 206 954 1160 17.0
10 240 208 952 1160 16.5
15 250 218 945 1163 14.0
20 259 227 940 1167 12.0
25 267 236 934 1170 10.5
30 274 243 929 1172 9.5
35 281 250 924 1174 8.5
40 287 256 920 1176 8.0
45 292 262 915 1177 7.0
50 298 267 912 1179 6.7
55 303 272 908 1180 6.2
60 307 277 905 1182 5.8
BTU/lb. Spec. Vol.
Heat of Latent Heat of Total Heat Ft
3
/lb
PSIG °F Liquid* Evaporation of Steam Sat. Vapor
65 312 282 901 1183 5.5
70 316 286 898 1184 5.2
75 320 290 895 1185 4.9
80 324 294 892 1186 4.7
85 328 298 889 1187 4.4
90 331 302 886 1188 4.2
95 335 306 883 1189 4.0
100 338 309 881 1190 3.9
110 344 316 876 1192 3.6
120 350 322 871 1193 3.3
125 353 325 868 1193 3.2
130 356 328 866 1194 3.1
140 361 334 861 1195 2.9
150 366 339 857 1196 2.7
160 371 344 853 1197 2.6
170 375 348 849 1197 2.5
180 380 353 845 1198 2.3
190 384 358 841 1199 2.2
200 388 362 837 1199 2.1
220 395 370 830 1200 2.0
240 403 378 823 1201 1.8
250 406 381 820 1201 1.75
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