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NATIONAL

TECHNICALNOTE2970

PHYSICALPROPERTIES03’ CONCENTRATEDNITRICACID

ByW. L. Sibbitt,C. R. St. Clair, T. R. Bump,P. F. Pagerey,J. P. Kern, andD. W. Fyfe

PurdueUniversity

WashingtonJune1953

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https://ntrs.nasa.gov/search.jsp?R=19930083628 2020-06-04T03:03:49+00:00Z

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NATIONALADVISORYcohMrrcEE

TECHNICALNOTE2970

PHYSICALPROPERTIESOF CONCENTRATED

ByW. L. Sibbitt,C.R. St.C1..air,P. F. Pagerey,J.P.Kern,andD.

NITRICACID

T.R. BumP,w“me

SUMMARY

A reviewofthedataexistingintheliteraturewascompletedandthenexperimentalmeasurementsweremadeinorderto obtainthephysicalpropertiesofwhitefumingnitricacid. Thee~erimentalmeasurementswere~de overthetemperaturerangefromapproximately-3’j0 F to 300°F.

Inthehigh-temperaturerange(above250°F) theacidwas ina stateofthermodynamicequilibrium;consequently,thesedatadonotapplyinthecaseofmostheat-transferoperationswhichusuallydo notallowsuf-ficienttimeforthermodynamicequilibriumtobe established.

Withtheexceptionof thevaporcomposition)thephysicalproperties5 percentoverthetemperaturerange

pressme(andofareknownwithinto 300°F.

INTRODUCTION

Themainobjectofthisof thethermalpropertiesof

coursetheacidapproximately

investigationwasto obtainreliablevaluesconcentratednitricacidfor

latingthe&ta obtainedinheat-transferresearchandincharacteristicsinvestigations.

Commerciallyavailablewhitefumingnitricacidwith

usein corre-fluid-friction-

notmorethan2 percentwatercontentwasspecifiedasthetypeofacidwhichwastobe studied.Acidsolutionsof thefollowingcompositions,inpercentbyweight,werestydiedinthisinvestigation:

HN03 N02 H20

97.35 “ 1.57 1.08

94.0 “5.0 1.0

99.01 .46 .53

.— —— --———

2

Thespecificationssxeas fo~ows:

Specificgravity.WeightfractionofWeightfractionofWeightfractionof

NACATN2970

forthecommercialgradeofwhitefumingnitricacid !.

. . . . . . . . . . . . . . . . . . 1.48to 1.50 “tio3 . . . . . . . . . . . . . . . . 0.857to0.945N02. . . . . . . . . . . . . . . . . 0H20. . . . . . . . . . . . . . . . . 0.055to0.lk3

A reviewoftheexistingliteraturewasconducted(seerefs.1 to32)andwheredatawerelackingthephysicalconstantsweredeterminedexperi-mentally.Itwasconsidereddesirableto obtaindataon thethermalcon-ductivity,thermalcapacity,viscosity,density,andvaporpressureoftheliquidphaseoverthetemperaturersagefromapproximately-35°to 300° F.Theexactrangesusedwereas follows:

Physicalproperty Temperaturerangeofinvestigation,OF

Thermalconductivity -h7.2 tO 122-c viscosity -34.6 to 300Specificheat 32 to 80Density -35 to 300Vaporpressure 32 to 310

Whitefumingnitricaciddecomposesevenat 32°F; however,attem-peraturesabove250°F thedecompositionisveryrapid.Itwouldbedesirabletomakeallphysical-propertymeasurementswithina veryshorttimeinterval- oftheorderofa second.Thermal-propertydetermina-tionsusuallyrequire- minutesorevenhoursforaccuratemeasure-ments.Intheseexperimentsonlythevapor-pressuremeasurementswerecarriedoutina timeintervalofa fewminutes.

Thisinvestigation,conductedintheMechanicalEngineeringLaboratoriesatPurdueUniversi@,wassponsoredby andconductedwiththefinamcialassistanceoftheNationalAdvisoryCommittee

APPARATUSANDMETHODSOF~

forAeronautics.

Thethermalconductivityofwhitefumingnitricacidwasdeterminedwitha concentric-cylinder,steady-statetypeofapparatus(refs.2, 9,and14). Theapparatuswasplaceddirectlyintheconstant-temperaturebathfluid.Thetemperaturedropacrosstheliquidlayerwasmeasuredwithcalibratedthermistors.

I

— .—. -———

.

,

NACATN2970

\The”dynamicviscosityofwhitefumingnitricacidwasmeasured

a modifiedOswaldviscometeroverthetemperaturerangefrom-~4.6°

3

with

to 32° F. A Lawaczeck,or falling-cylinder,viscomet&wasus~doverthetemperaturerangefrom71.6° to 300°F. Thesesecondaryinstrumentswerecalibratedwithwaterandcarbontetrachloride(ref.10).

ThePurduemeasurementsof specificheatweremadewitha nonflow,bellowstypeof calorimeterwhichhadbeendevelopedforusewithvola-tileliquids.

A sealed-flaskpycnometerwas-usedina liquidconstant-temperaturebathto determinethedensityoftheliquidwhitefundngnitricacidinthetemperaturerangefrom-35°to 100°F. A pycnometermde fromaselected

Textube(2-mminsidediameter,8-mmoutsidediameter,and

80 cmlong wasusedinan airbathforthetemperaturerangefromlOOOta 300°F.

A staticmethodwasusedformeasuringthevaporpressureofwhitefumingnitricacid.A SmithandMenziesisoteniscopewasusedinthetemperaturerangefrom3Z0to 190°F. Vapor-pressurehotisof @ass,H.S.25 (L605)alloy,andstainlesssteel(AISIType347)wereusedinthetemperaturera~e from200°to300°F.

RESULTS

TherecommendedpropertiesofwhitefumingnitricintablesI andIIandfigures1 to 7.

Theabsoluteaccuracyofthethermal-conductivity

acidaregiven

measurementswasabout5 percent(upto 122°F). Theextrapolationof-thesedatato 300°Fisprobablyof thesameorderof accuracy.

Themaximumerrorsintheviscositymeas~ementswereoftheorderof 5 percentat 300°F. Theerrorsat roomtemperaturewerelessthan1 percent.

Sincemostofthespecific-heatvaluesweretakenfromthelitera-turetheaccuracyisunknown.Apparentlytheerrorsaresomewhatlessthan5 percentovertheentiretemperaturerange.

Thedensitydeterminationswerewithinam accuracyof 0.2percentintheregionbelow100°F. At 300°F themaximumerrormighthavebeenasmuchas 4 percent.

Thevaporpressureofnitricacidbelow600Chasbeenaccuratelydetermined.Inthetemperaturersmgeabove90° Cthevaporpressure

-—.— ——— — —–- .—.— — .—= -—

4 NACATN 2970

maywiryby morethana factorof 10atanytemperaturedependinguponthevayor-to-l.iquidvolumeratio;vaporpressuresgreaterthan1,000lb/sqin.mayreadily_beobtainedU thevapor-to-liquidvolumeratioislessthan10percent.Highervaporpressureswereobservedinglassapparatusthan oinmetalapparatus.At 300°F theequilibriumstatewasattatiedintheorderof 1 mhute (depend@ ontheVapor-to-liqyidvolumeratio).

High-purityalminw andH.S..~ (L605 ) weresatisfactorymate-rialsforusewithnitricacid.Kel-Fsolids,greases,waxes,andoils;fluorolfies;andTeflonwerealsosatisfactorymaterials.

ANALYSISANDDISCUSSION

Thevariablemcmtdifficultto controlinthisinvestigationwasthecompositionoftheacid. Twolitersof comercialacidweretakenfroma stainless-steeltankwhichcontainedabout100gallonsofacid.The2-literglasssamplebottlewasmaintainedatroomtemperature;however,theconcpositionoftheacidsamplechangedastheliquidvolumewaOdecreased.Thecommercialacidcontainednickelandchromiumcom-poundsaswellastheoriginaldecompositionproducts.Theequilibriumliquid-phasecompositionwasa functionofthetemperature,pressure,andliquid-vaporvohxneratio.

Theanalyticalmethodswerenotsufficientlyaccurateto specifythecompositionoftheliqyidphase.As an exemple,theviscosityandvaporpressureweremeasuredat 3000F andapproximately1,500lb/sqin.Attemptsto obtainrepresentativeliquidsamplesat 3000F and1,500Ib/sqin.werenotsuccessful.Whentheacidwascooledtoroomtemperaturethenthel.iqtid-phasecompositionchangedbecauseofthechangeofgassohibilitiestitheliquidandthechangeofpartialpres.suresb thegasphase.

InitialJ.ya HoepplerPrecisionViscosimeter(accuracyofbetterthan0.1percent)wasusedforthetiscositymeasurements.Viscositychangesas geat as 1 percentoccurredina 10-hourperiodat 100°F;however,thechemicalana@is indicatedno changein composition.Thenitricacidshowedappreciabledecompositionattemperaturesabove100°F;therefore,theacidssmpleswereheldatthehightemperaturesonlyfora ~um periodoftime.At temperaturesabove250°F theI.iqtidphasewasprobablyinthermodynamiceqdl.ibrimn;whileatteqeraturesbelow250°F theexactconditionsarenot@oh.

Theviscosityof acid(above200°F)withlessthan2 percentwaterisnota sensitivefunctionoftheN02contentintherangefrom1 to5 percentN02;consequently,thedegreeof completionofaciddecomposi-tionisnotof greatiqortance. !

.

5

.

NACATN2970

Thestraightprobablevalueof

lineinfigure1 is consideredasthethermalconductivityofwhite

representingthefumingnitricacid

~th an accuracyof~5percent.Themxi&nndispersionoftheexperi-mentalmeasurementsfromtherecormnendedvaluesina 1000F ramge-waslessthan2.4 percent.Thisdispersionwaspsrtlydueto thechangeinacidcomposition.Thevaluesreportedby VanderHeldandVanDrunen(ref.3)wereobtainedby an interestingunsteady-statemethodandareofthecorrectorderofmagnitude:Valuesreportedinreference3 forothercompoundsdifferasmuchas 14percentfromtheacceptedvaluesofthermalconductivity.Theprimarymeasurementsofthethermalconduc-tivityofwatermadeatPurduewerewithin1.6 percentof theacceptedvalues.Otherdataon solutionsofNaCl,KC1,MgC12,andCaC12 showalineartemperaturecoefficientofthermalconductivityovera temperaturerangegreaterthan100°F; consequently,a linearetirapolationfornitricacid(constantcomposition)appearstobe reasonable.

Thespecificheatofwhitefumingnitricacidhasbeenmeasuredlya numberof investigatorsoverthetemperaturerangefrom-40°to 300°F(refs.19,20,and31,p. 572). Thevaluesforpureacidat 320F (wherethecompositioncanbe accurateQknown)differasmuchas6 percent.Thisdisagreementisdifficultto explain;however,itisprobablyduetodifferentacidcompositions.Acidsofvariouscompositionsshowedthesamespecific-heatvalueatabout90°F. ForthesystemHNO~-~0the

specificheatisa linearfunctionof thewatercontentandsmountstoovera 2 percentincreaseinthespecificheatperweightpercentofwater.

Thedensitydataasreportedby a nuder of investigatorsareinqualitativeagreementat 100°F; however,thetemperaturecoefficientsofsomeof thedatareportedshowwidevariationsat 0°and200°F. Wateradditionsdecreasethedensityof nitricacidwhileN02increasesthedensity.

Thekineticsof thedeconqxxitionof nitricacidhavenotbeencom-pletelyestablished.Apparentlythepureaciddecomposesas follows:

4m03= 4N02+ 2H20+ 02

Theseproductsarenottheendproductsofthedecompositionofcommercialnitricacidina metalcontainer.Thedecompositionproductshavedensityeffectswhichopposeeachother;however,theN02sadH20arenotformedinequalamountsandtheirdistributionbetweentheliquid

,, andvaporphaseisunknown. .

# ..

-— .—— —- -——. ———. .— --—-

6 NACATM 2970

Thevaporpressuresofnitric-acidsolutionshavebeenmeasuredoverthetemperaturerangefrom-30°to 300°F. Excellentdataareavailableup to 140°F. ApproximatevaluesofvaporpressureareavailableinthetemperaturerangefromlkOOto 200°F. Thevaporpressureinthetem-peratureramgeabove200°F wasa sensitivefunctionofthevapor-liquidvolumeratioandthematerialofthecontainer.

CONCLUDINGREIW3KS

Therecommendedvaluesofthephysicalpropertiesofwhitefumingnitricacid(lessthan2 percentwater)aregivenforthetemperaturerangePromapproximately-35°to300°F. Valuesaregivenforthethermalconductivity,dynamicviscosity,specificheat,density,andvaporpres-surebasedondataobtainedfroma reviewoftheliteratureandfromexperhnentalmeasurements.

AIJacidanalysesweremadeatroomtemperatureandarenotindicativeofthecompositionat temperaturesabove200°F.

PurdueUniversity,Lafayette,Ind.,December1,lg51.

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NACATN 2970 ‘i’

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.,

1.

2.

3*

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

REFERENms

Wellman,E. J.: A SurveyoftheThermodynamicofWater.M. S. Thesis,PurdueUniv.,1950.

andPhysicalProperties

Pagerey,P.F.: TheThermalConductivityofLiquids.M. S.Thesis,PurdueUniv.,1951.

VanderHeld,E.F.M.,andVanDrunen,F. G.: A MethodofMeasuringtheThermalConductivityofLiquids.*sica, vol.15,Oct.1949,pp.865-881.

ReideljL.: NeueFl”&sigkeiten.pp.321-324.

W&meleitfahig- Keitsmessungenan OrganischenChemie-Ing.-Technik,Pd.23,No.13,July14,lg51,

McAdams,WilliamH.: HeatTransmission.Secondcd.,McGraw-HillEookCo.,Inc.,1942,p. 389.

Jaeger,G.: UeberderW&.mleitungs-l%higkeitSalzl&ungen.I&ad.Wiss.,Math.-Naturwiss.Sitzungsber.,Abt.2A,m. 99,1891,pp.245-265.

Beckmann,Wilhelm:DieW“~efibertragunginZyltidrischenGasschichtenbeinat”tilicherKonvektion.Forsch.Geb.Ing.-Wes.,Ed.2,Nr.~,May1931,pp.165-178;Nr.6, June1931,pp.213-217;Nr.11,Nov.1931,p. 407.

Mull,w.,andReiher,H.: Derl&meschutzvonL~tschichten.Gesundheits-Ing.Beihefte,ReiheI,Heft28,Nov.1, 1930,p. 705.

Woolf,J.R.: ExperimentalDeterminationoftheThermalConductivityofFluids.Ph.D. Thesis,PurdueUniv.,1951.

Kern,J.P.: TheViscosityof ConcentratedNitricAcid. M. S.Thesis,PurdueUniv.,1951.

NationalResearchCouncil(EdwardW.Washburn,cd.): International&iti@ Tables.Vol.~1. Firstcd-,McGraw-Hillwok Coo,fic1930,p. 212. “9

LawaczeckjF.: Ueber%higkeitund~~gkeitsmessung.Z.V.D.I.,M. 63,Nr.29,JUIY19,1919,pp.677-682.

Erk,S.: Z%higkeitsmessimgenan &.&sigkeitenundUntersuchungenvonViskosimetern.Heft288,ForscQ.-Arb.Geb.Ing.-Wes.,1927.

mid-, P.W.: TheEffectofPressureontheViscosityofForty-threePureLiquids.Proc.h. Acad.ArtsandSci.,vol.61,no-.j,1926,pp.57-99.

. . . . . ..__— —._— _———

8

15.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

NACATN2970

Hawkins,G. A.: TheViscosityofWater.Ph.D. ThesisjPurdueUniv.,1935.

Stakelbeck,H.: UeberdiefiigkeitverschiedenerK&temittelimfl”tisigenunddsmpff&migenZustandinAbhHngigkeitvonDruckundTemperature.2s.gesanrteK&lte-Industrie,Ed.40,Heft3,l&r..9,1933,pp.33-40. .

Anon.: !l%blesamnuellesde constantsIntoPermanentComm.Constants,Int.p. 43;VO1.8,1927-28,P. 58.

Hod-, CharlesD.,cd.: Handbookof

etdonn~esnum&iquesde chtiie.Assoc.Acad.,vol.6, 1923-24,

ChmnistryandPhysics.Twenty-third-ed.,Chem.~ber Pub.Co. (Cleveland),1939,pp.1325-1328.

ForsythejW.R.,andGiauque,W. F.: TheEntropiesofNitricAcidandItsMono-andTri-Hydrates.TheirHeatCapacitiesl?rcm15to300°K. TheHeatsofDilutionat 298.1°K. TheInternalRotationandl?reeEnergyofNitricAcidGas. ThePartialPressuresOverItsAqueousSolution.Jour.Am.Chem.SoC.,vol.64,pt.1,Jan.-June1942,pp.48-61;vol.64,pt.2, July-Dec.1942,p. 2067;vol.65,pt.2, July-Dec.1943,p. 2479.

Gmelin,P.: BAndbuchd= anorganischeChemie.Ed.2,Heft4. VerlagChemie,G.m.b.H.(Berlin),1936,p. %5. .

NationalRes&archCouncil(Washburn,EdwardW.,cd.): InternationalCriticalTables.Vol.III,McGraw-HillWok Co.,Inc.,1528,PP.59~304.

Sproesser,W. C.,andTaylor,G.B.: VaporWessuresofAqueousSolutionsofNitricAcid. Jour.Am.Chem.Sot., vol.43,pt.2,July-Dec.1921,pp.1782-1787.

Taylor,G.B.: VaporFYessureofAqueousSolutionsofNitricAcid.Ind.andEng.Chem.,vol.17,no.6, June1,1925,pp.633-635.

Wilson,G.L.,andMiles,F.D.: ThePartiall&essuresofNitricAcid- WaterMixturesfrcm0°to 20°C. bans.FaradaySot.,vol.XxxvI,1940,pp.356-363.

Klemenc,A.,andNagel,A.: DiePartialdruckeWabrigerSalpet.~-S&relosungenbei12,5und30°- EinigeTensionenderSchlzsaurebei12,5°.ZS.anorg.undallgan.Chemie,Ed.175,Heft3, June3,1%6, pp.257-268.

~p NACATN29709

.26.

27.

28.

29.

30.

31.

32.“

KLemenc,A.,andRupp,J.: ZurKenntnisderSalpeterstiure.VI.DieTotaldampfdruckederL6sungenvonStickstoffdioxylinHoch-konzentrierterbisabsoluterSalpeters&reunddieentsprechendenDichten.Zs.anorg.undallgem.Chemie,Ed.19, Heft1,Oct.4,1930,pp.51-72.

BerljE.,andSaengerjH. H.: uberdasSystemN2~-HN~. MonatshefteChemieundverwsmdteTeileandererWiss.,Ed.53-54,1929,PP.1036-1056.

Egan,E. P.,Jr.: VaporPressureofLiquidNitricAcid. Ind.andEng.Chem.,vol.37,no.3,Mar.1945,PP.303-304.

Smith,A.,andMenzies,A.W.: StudiesinVaporFressure:III. AStaticMethodforDeterminingtheVaporPressuresof SolidsandLiquids.Jour.Am.Chem.SOC.,VO1.32,pt.2, July-Dec.1910,pp.1412-1434.

Ztierli,A.: Manometer.U. S.Patent2,075,326,Mar.30,1937.

Mellor,J.W.: A Comprehensive‘lhatiseon InorganicandTheoreticalChemistry.Vol.3. Iongnans,GreenandCo.,1928,pp.569and572.

Uhlig,HerbertH.,cd.: TheCorrosionHandbook.JohnWiley& Sons,Inc:,1948.

.

—. —. —— —___ —

I

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WI

molmmamllPRomm!ms OFNITRICAC@

-=-ture, conductivity,OF Btu/(hr)(sqft)(m/ft)

-30 0.145.lm

$ .157’lm .ti6lW .1

1?.13250 .191~co .199

viscosity,centipoises

2.461.731.08.726.525.397.314.254 I

0.423 1.617.423 1.5%7.423 1.537.b23 ;.~.423.bd+ l:3m.129 1.337.456 I.290

0.0590.d+23.0273.Ol@.0142.Oul.00908.00763

17.351.I.81

;:Z3.072.231.-/7-1.35

tempera-ture,o~

-34.3-17.81037.865.693.3

I-21.lti8.9

%ontains95 to 97.5 percentby weightofHN% andlessthsa2 percentbyweightof H20 .

‘E?

*,

TM3L 511

VAPORPR.F9SUBXOFNITRICAC~a

Temperature,OF

;:g

104I-22158176194212

Vaporpressure,mm ofHg,of -

lW)percentHNq

(b)

14.426.6g.;

133“208%7%70937

%,2&

(c)

5.5u2037.364.4

107242354Wk710

Temperature,o~

%rder of 50 to 10Qpercentrelativevaporvolm. ~?Oatatakenfromreference28,cDatitaken from reference 22.

%rimapdated values.

PP

12 NACATN 2970

.20

~+ & Regionof experimentalvalues /2%.19 ———— Regionof extrapolation / ‘~ /um

/ ‘~.18 //3 /z. / ‘

/“:.17z /o4 / ‘co

0.16=EL21-

.!5

/ =S=

.14-50 0 50 100 I50 200 250 300 “F

‘45.6 IZ8 10 37.8 65.6 93.3 121-1 148.9“CTemperature

—.

Figure1.-Recommendedvaluesofthermalconductivityofnitricacid.Datatakenfromreference2 forwhitefumingnitricacidwithcom-position(inpercentby weight)of: HIJ03,99.01;N02,O.46;H@, 0.53.

108

65

4

3

2

I

,8 L

.6

.5

.4 ‘\

b

.3 i1

.2

‘=%$=

:\o 40 60 80 100 120 140 160 200 240w-4 :2 : 104 I40 176 212 248 284 320 392 464°F

Tempemture

Figure 2.- Reccmmmnded valuea of viscosity of nitric acid. Data takenfrom reference lo for white fuming nitric acid with cmirpoaition(inpercent by weight) of: ~3, 97.37; ~2, 1.57; H@, 1.08.Densityat0° C, 1.575%gramapercubiccenttiter.

G

Figure 3.- Recmmuended values of apecific heat of white fuming nitricacid containing $5 to 97.5 percent HNc+j. (IM.a frcm refs. 19,20,and31.)

I

I

1.64 I I I I I 1 I

1.62\ 95% HN03, 5% N02 (Ref. 26)

\\k1.60 -

,+ ~97.35% HN03, 1.57% NO2, 1.08% H20 (T.R. Bump, p urdue Uri v.)

1,58 I

+\.

\I I

-loo% HN031.56

\’ \

1.54 T 9 A \98% HN03<

1.52 – 2% H20 -94% HN03, 5.0% N02 ,1.0%H20

1.50(T,R, Bump, Purdue Univ. )

1.48 /

95% HN03</ -

+ ,b \\: 1.46 —

5% H20 \\ ,

g I,* — (Ref. 22, P.59)? i

~ \ \~ 1.42 \

\ \1.40 \

L38- ,\

\\

Region of experimental values1.36 – \’ \

— — — Region of extropolaticm

1.34 \ \

1.32 \’ \\

1.30- \\0 40 80 120 160

X240

-17.8 4.4280 320 0F

267 48.9 71.1 :E 115.6 137.8 160 “CTemperature

] - 4.- Recommenced values of density of nitric-acid solutions.

100 / /

80/ /

Weight / /,

60 percent.,

/50

/HN03 ( // /

40+ 100 ,0 90 / /

30x 80 / /

/Region of experimental values / /

20 - — ——– Region af extrapalatbn ‘./ / /

/

%/+

0

=1 o /

$8,+’ x

-. 6 +’ } (/

x: 5

g 4 +’ P x

k 3 r

+’,

x

2(

.. +

~ 0

-

J20 20 80 100 120 140 160-4 3%- 68

2CXI 240”CIY4 ?& 176 212 248 284 320 392 464°F

Temperature

- (a) Data from reference 21-, pwe 304.

Figure ~.- Vapa preBsure of concentrated nitric acid.

,

,

Ilooxlo~

70 -

50 ❑ Glassbomb I % Vapor volume40

300 Metal bomb 10% Vapor valume

20

10

7

5

4

3

2

-’20 20-4

40 6080:2

100 120 140 16068

200 “c104 140 176 212 248 284 320 392 “F

Temperature

(b) Purdue data. Composition of acid (in percent by might): ~3,

97.35;NQ2,1.57.

Figure 5..mnclti.

!

I

{

100

70

5040

30

20m33uE 10=:7~

5-4

3

2

!20 20 40 60 80 100 120 140 160160200 ‘C-4 :2 68 104 140 176 212 248 284 320356392 “F

Temperature

Figure 6.- Recommended values of Prandtl mxlulus of nitric acid. Cam-pcmition of acid (in percent by weight): HH03, 97.35; N02, 1.57;

QO, 1.o8.

._

.,

I

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.07

.05

.04~

.03 \ft2

.02- r~

g .01‘ \

z,~.007~

\

.-; .005Eg .004

2 .003

,002 >

.001-20 40 60 80 100 120 140 160°C-4 :2 %’ I04 I40 176 212 248 284 320°F

Temperature

Figure 7.- Recommen&d values of kinematic viscosity of nitric acid.