Vapour pressures from 0.2 to 6 MPa 3.4.5



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3.4.5 Vapour pressures from 0.2 to 6 MPa

Kelvin temperatures are listed for pressures p from 0.2 to 6 MPa. Values of the critical temperatures and pressures are given in section 3.5. The letter ‘s’ indicates a solid.

Elements and inorganic compounds

Element or compound	Pressure, p/(MPa)
	0.2	0.5	1	2	3	4	5	6

Ammonia . . . . . . . . .	254.3	277.3	298.0	322.5	338.9	351.6	362.0	371.0
Argon . . . . . . . . . .	94.3	105.8	116.6	129.8	138.7	145.7
Bromine . . . . . . . . .	354	389	421	459	485	506	523	537
Carbon dioxide . . . . . .	203.3 s	216.0 s	233.0	253.6	267.6	278.4	287.4	295.1
Carbon disulphide . . . . . .	342	377	409	448	474	495	512	528
Carbon monoxide . . . . .	88.0	98.8	108.9	121.2	129.5
Carbonyl chloride (phosgene)	299	330	359	393	415	433	447
Chlorine . . . . . . . .	256	283	308	338	358	374	387	398
Cyanogen . . . . . . .	268	294	317	345	364	379	391	401
Dinitrogen oxide . . . . .	197	217	235	257	272	283	293	301
Hydrogen . . . . . . . .	22.8	27.1	31.2
Hydrogen bromide . . . .	221	244	265	291	309	322	334	343
Hydrogen chloride . . . .	201	222	241	264	279	291	301	309
Hydrogen cyanide . . . .	318	350	378	410	430	445
Hydrogen fluoride . . . . .	312	344	371	402	421	436	448	457
Hydrogen iodide . . . . .	255	282	307	338	359	376	390	402
Hydrogen sulphide . . . .	227	251	273	299	316	330	341	350
Krypton . . . . . . . .	129.2	144.7	159.2	176.8	188.8	198.2	206.0
Neon . . . . . . . . .	29.6	33.7	37.5	42.2
Nitrogen . . . . . . .	83.6	94.0	103.8	115.6	123.6
Nitrogen dioxide . . . .	310	332	352	373	387	396	404	411
Nitrogen oxide . . . . .	128	138	148	159	166	171	175	179
Oxygen . . . . . . . .	97.2	108.8	119.6	132.7	141.7	148.7	154.4
Silicon tetrafluoride . . . .	185	201	217	238	252
Sulphur dioxide . . . .	279	306	330	358	377	392	404	414
Sulphur hexafluoride . . .	219.6	243.4	265.2	291.1	308.4
Sulphur trioxide . . . .	333	358	381	411	431	447	460	471
Tin (IV) chloride . . . .	414	456	495	543	574
Xenon . . . . . . . .	177.8	198.9	218.6	242.5	258.8	271.6	282.2

Organic compounds
Refrigerant numbers (British Standard 4580) are given in parentheses for some halogenated alkanes.

Compound	Pressure, p/(MPa)
	0.2	0.5	1	2	3	4	5	6

Acetic acid . . . . . .	415	452	485	523	548	567	582
Acetone . . . . . . . .	351	385	416	453	478	497
Acetylene . . . . . . .	201	221	240	263	278	289	299	307
Aniline. . . . . . . . .	485	530	570	617	649	673	692
Benzene . . . . . . . .	377	416	452	495	524	546
Bromobenzene . . . .	459	505	547	598	633	659
Bromoethane . . . . .	333	367	398	434	458	475	490	501
Bromotrifluoromethane
(R13B1)	231	256	279	307	326
Buta-1,3-diene . . . . .	288	318	347	381	403	421
Butane . . . . . . . .	292	324	352	388	411
Carbon tetrachloride . . .	374	413	450	494	523	546
Chlorobenzene . . . . .	432	476	516	564	596	621
Chlorodifluoromethane (R22) .	248	273	297	324	343	358
Chloroethane . . . . . . .	305	337	366	401	424	442	457
Chloroform . . . . . . .	357	393	426	466	493	514	531
Chloromethane . . . . . .	266	293	319	349	369	385	398	410
Chlorotrifluoromethane (R13) .	205	228	249	274	290
Dichlorodifluoromethane
(R12) . . . . . . . .	261	289	315	346	367	383
1,2-Dichlorotetrafluoroethane (R114) . . . . . .	296	328	357	391	414
Diethyl ether . . . . .	328	362	393	430	454
Ethane . . . . . . .	198	220	241	266	283	296
Ethanol . . . . . .	370	398	424	454	474	489	502	513
Ethyl acetate . . . . .	373	408	441	480	506
Ethylene . . . . . .	182	202	221	244	260	272	282
Hexane . . . . . .	365	403	438	480	507
Methane . . . . . .	121	135	149	166	177	186
Methanol . . . . . .	356	385	410	439	458	473	485	495
Methyl acetate . . . .	351	385	415	452	476	496
Pentane . . . . . .	331	366	398	436	462
Phenol . . . . . . .	482	525	564	610	639	661	679	693
Toluene . . . . . .	410	451	490	536	566	590
Trichlorofluoromethane (R11).	318	352	383	420	443	465

D.Ambrose

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