Ideal Gas Heat Capacity at Constant Pressure - SI Units

Written by Matt Milbury on . Posted in Tables

These tables are for the Heat Capacity of isobaric (constant pressure) ideal gasses at different tempeartures.  Isobaric means that the pressure is held constant as the temperature increases.  This is designated as Cp in most equations in heat transfer.

 Units: kJ/(kg K)

 

100 K

150 K 200 K 250 K

300 K

350 K

400 K

450 K

500 K

550 K

600 K

Methane

2.0742

2.0759

2.0890

2.1360

2.2301

2.3663

2.5312

2.7118

2.8989

3.0868

3.2720

Ethane

1.1871

1.2846

1.4048

1.5617

1.7523

1.9626

2.1785

1.3904

2.5935

2.7858

2.9671

Propane

0.9365

1.1064

1.2714

1.4616

1.6771

1.9050

2.1321

2.3496

2.5537

2.7434

2.9194

Butane

-

1.1579

1.3157

1.4944

1.7024

1.9251

2.1472

2.3595

2.5581

2.7422

2.9126

Isobutane

-

1.0373

1.2359

1.4442

1.6713

1.9078

2.1411

2.3624

2.5681

2.7574

2.9313

Pentane

-

1.1214

1.2966

1.4703

1.6716

1.8915

2.1143

2.3292

2.5313

2.7194

2.8939

Isopentane

-

0.9488

1.1782

1.4163

1.6563

1.8927

2.1210

2.3380

2.5416

2.7308

2.9058

Neopentane

-

-

-

-

1.6849

1.9344

2.1664

2.3840

2.5894

2.7846

2.9704

Hexane

-

-

1.2832

1.4607

1.6625

1.8829

2.1062

2.3212

2.5222

2.7078

2.8786

Heptane

-

-

1.2739

1.4518

1.6565

1.8787

2.1023

2.3164

2.5159

2.6997

2.8684

Octane

-

-

-

1.4453

1.6519

1.8753

2.0988

2.3121

2.5107

2.6934

2.8608

Ammonia

-

-

2.0084

2.0364

2.0953

2.1743

2.2666

2.3681

2.4759

2.5879

2.7024

Argon

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

0.5203

Benzene

-

-

-

-

1.0547

1.2518

1.4337

1.6010

1.7543

1.8941

2.0211

Carbon dioxide

-

-

-

0.7916

0.8458

0.8951

0.9392

0.9786

1.0141

1.0463

1.0755

Carbon monoxide

1.0388

1.0390

1.0390

1.0388

1.0385

1.0384

1.0384

1.0386

1.0390

1.0396

1.0405

Cyclohexane

-

-

-

-

1.2730

1.5342

1.7852

2.0280

2.2591

2.4756

2.6759

Cyclopropane

-

-

-

-

1.3371

1.5814

1.8225

2.0480

2.2519

2.4339

2.5999

Deuterium

7.4682

7.3039

7.2477

7.2459

7.2499

7.2526

7.2570

7.2667

7.2842

7.3108

7.3468

Ethylene

-

1.1999

1.2602

1.3768

1.5338

1.7098

1.8889

2.0169

2.2248

2.3762

2.5166

Temperature

100 K

150 K

200 K

250 K

300 K

350 K

400 K

450 K

500 K

550 K

600 K

Fluorine

0.7662

0.7693

0.7812

0.8013

0.8247

0.8475

0.8681

0.8859

0.9012

0.9142

0.9253

Heavy water

-

-

-

-

1.7122

1.7439

1.7788

1.8164

1.8560

1.8971

1.9393

Helium

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

5.1931

Hydrogen

11.1950

12.5910

13.5300

14.0450

14.3090

14.4290

14.4730

14.4920

14.5110

14.5290

14.5350

Hydrogen sulfide

-

-

0.9809

0.9913

1.0059

1.0241

1.0451

1.0683

1.0931

1.1189

1.1454

Krypton

-

0.2480

0.2480

0.2480

0.2480

0.2480

0.2480

0.2480

0.2480

0.2480

0.2480

Methanol

-

-

1.2384

1.2923

1.3775

1.4873

1.6101

1.7368

1.8616

1.9814

2.0952

Neon

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

1.0301

Nitrogen

1.0389

1.0390

1.0391

1.0392

1.0397

1.0412

1.0441

1.0490

1.0559

1.0646

1.0748

Nitrogen trifluoride

0.4793

0.5287

0.6024

0.6809

0.7541

0.8178

0.8711

0.9150

0.9514

0.9830

1.0127

Oxygen

0.9098

0.9098

0.9102

0.9126

0.9183

0.9280

0.9409

0.9558

0.9717

0.9876

1.0030

Parahydrogen

13.4080

16.1880

16.0710

15.3290

14.8360

14.6240

14.5730

14.5870

14.6150

14.6330

14.6380

Perfluorobutane

-

-

0.6181

0.7188

0.8069

0.8835

0.9495

1.0059

1.0537

1.0938

1.1273

Perfluoropentane

-

-

-

0.7283

0.8176

0.8952

0.9621

1.0192

1.0676

1.1083

1.1422

Perfluoropropane

-

0.5023

0.6100

0.7054

0.7894

0.8627

0.9263

0.9809

1.0274

1.0667

1.0996

Propylene

-

1.0550

1.1898

1.3545

1.5375

1.7259

1.9116

2.0901

2.2592

2.4178

2.5658

Propyne

-

-

-

-

1.5199

1.6703

1.8100

1.9398

2.0602

2.1722

2.2763

Sulfur dioxide

-

-

-

-

0.6229

0.6518

0.6785

0.7029

0.7252

0.7454

0.7635

Sulfur hexafluoride

-

-

-

0.5779

0.6674

0.7397

0.7971

0.8427

0.8790

0.9082

0.9318

Toluene

-

-

0.7409

0.9347

1.1347

1.3316

1.5206

1.6978

1.8608

2.0093

2.1439

Temperature

100 K

150 K

200 K

250 K

300 K

350 K

400 K

450 K

500 K

550 K

600 K

Water

-

-

-

-

1.8648

1.8806

1.9018

1.9272

1.9554

1.9852

2.0163

Xenon

-

-

0.1583

0.1583

0.1583

0.1583

0.1583

0.1583

0.1583

0.1583

0.1583

R-ll

-

-

0.4719

0.5283

0.5738

0.6106

0.6402

0.6641

0.6836

0.6996

0.7128

R-113

-

-

-

0.5896

0.6501

0.6998

0.7413

0.7761

0.8055

0.8303

0.8513

R-114

-

-

-

-

0.6925

0.7454

0.7912

0.8308

0.8648

0.8933

0.9156

R-115

-

-

0.5458

0.6380

0.7156

0.7801

0.8330

0.8757

0.9098

0.9368

0.9582

R-116

-

-

0.5985

0.6890

0.7722

0.8445

0.9060

0.9580

1.0020

1.0391

1.0707

R-12

-

0.4113

0.4873

0.5511

0.6045

0.6490

0.6860

0.7166

0.7421

0.7633

0.7810

R-123

-

-

0.5312

0.6069

0.6731

0.7310

0.7819

0.8267

0.8667

0.9031

0.9369

R-124

-

0.4935

0.5777

0.6557

0.7284

0.7968

0.8619

0.9247

0.9862

1.0474

1.1092

R-125

-

-

0.6187

0.7079

0.7901

0.8658

0.9345

0.9957

1.0492

1.0957

1.1358

R-13

0.3445

0.4304

0.5081

0.5776

0.6389

0.6921

0.7371

0.7738

0.8024

0.8228

0.8350

R-134a

-

-

0.6457

0.7448

0.8367

0.9230

1.0047

1.0828

1.1577

1.2299

1.2998

R-14

0.3944

0.4576

0.5361

0.6187

0.6972

0.7664

0.8238

0.8698

0.9080

0.9445

0.9887

R-141b

-

-

0.5943

0.6789

0.7562

0.8263

0.8891

0.9445

0.9927

1.0336

1.0673

R-142b

-

0.5331

0.6406

0.7402

0.8319

0.9157

0.9916

1.0596

1.1196

1.1718

1.2160

R-143a

-

-

0.7119

0.8260

0.9329

1.0318

1.1221

1.2038

1.2771

1.3427

1.4015

R-152a

-

-

0.7968

0.9101

1.0259

1.1417

1.2548

1.3626

1.4625

1.5518

1.6278

R-22

-

0.4660

0.5292

0.5915

0.6518

0.7088

0.7613

0.8086

0.8506

0.8877

0.9204

R-227ea

-

-

-

0.7126

0.8018

0.8818

0.9524

1.0138

1.0660

1.1088

1.1424

Temperature

100 K

150 K

200 K

250 K

300 K

350 K

400 K

450 K

500 K

550 K

600 K

R-23

-

0.5261

0.5887

0.6590

0.7318

0.8035

0.8712

0.9333

0.9894

1.0393

1.0836

R-236ea

-

-

-

0.7699

0.8505

0.9261

0.9966

1.0621

1.1224

1.1777

1.2278

R-236fa

-

-

0.6610

0.7412

0.8226

0.9052

0.9889

1.0738

1.1598

1.2470

1.3354

R-245ca

-

-

-

0.7738

0.8923

0.9968

1.0874

1.1640

1.2265

1.2751

1.3097

R-245fa

-

-

-

0.7684

0.8640

0.9541

1.0389

1.1183

1.1924

1.2610

1.3243

R-32

-

0.6667

0.7058

0.7597

0.8282

0.9060

0.9871

1.0666

1.1421

1.2124

1.2773

R-41

-

-

0.9882

1.0368

1.1077

1.1955

1.2951

1.4012

1.5085

1.6119

1.7062

RC318

-

-

-

0.7005

0.7848

0.8599

0.9264

0.9848

1.0358

1.0799

1.1178

Temperature

100 K

150 K

200 K

250 K

300 K

350 K

400 K

450 K

500 K

550 K

600 K