Chemical Properties of Chloromethane (CAS 74-87-3)

InChI

InChI=1S/CH3Cl/c1-2/h1H3

InChI Key

NEHMKBQYUWJMIP-UHFFFAOYSA-N

Formula

CH3Cl

SMILES

CCl

Molecular Weight¹

50.49

CAS

74-87-3

Other Names

• Artic
• CH3Cl
• Chloor-methaan
• Chlor-methan
• Chlorure de methyle
• Clorometano
• Cloruro di metile
• Methylchlorid
• Metylu chlorek
• Monochloromethane
• R 40
• R-40
• Rcra waste number U045
• Refrigerant R40
• UN 1063
• freon 40
• methane, chloro-
• methyl chloride

• ω : Acentric Factor.
• PAff : Proton affinity (kJ/mol).
• BasG : Gas basicity (kJ/mol).
• Δ_cH°_gas : Standard gas enthalpy of combustion (kJ/mol).
• C_p,gas : Ideal gas heat capacity (J/mol×K).
• C_p,liquid : Liquid phase heat capacity (J/mol×K).
• η : Dynamic viscosity (Pa×s).
• Δ_fG° : Standard Gibbs free energy of formation (kJ/mol).
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fH°_liquid : Liquid phase enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH° : Enthalpy of fusion at standard conditions (kJ/mol).
• Δ_fusH : Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_subH : Enthalpy of sublimation at a given temperature (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• Δ_vapH : Enthalpy of vaporization at a given temperature (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• McVol : McGowan's characteristic volume (ml/mol).
• P_c : Critical Pressure (kPa).
• P_triple : Triple Point Pressure (kPa).
• P_vap : Vapor pressure (kPa).
• ρ_c : Critical density (kg/m³).
• I_np : Non-polar retention indices.
• Δ_fusS : Entropy of fusion at a given temperature (J/mol×K).
• S°_liquid : Liquid phase molar entropy at standard conditions (J/mol×K).
• Δ_vapS : Entropy of vaporization at a given temperature (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• T_triple : Triple Point Temperature (K).
• V_c : Critical Volume (m³/kmol).
• v_spec : Specific Volume (m³/kg).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ω	0.1301		Relay (1.0) Calculated Property
PAff	647.30	kJ/mol	NIST
BasG	621.10	kJ/mol	NIST
ΔcH°gas	-764.00 ± 0.50	kJ/mol	NIST
ΔfG°	-54.39	kJ/mol	Joback Calculated Property
ΔfH°gas	[-85.90; -81.90]	kJ/mol
ΔfH°gas	-81.90 ± 1.50	kJ/mol	NIST
ΔfH°gas	-81.96 ± 0.67	kJ/mol	NIST
ΔfH°gas	-85.90 ± 0.59	kJ/mol	NIST
ΔfH°liquid	-102.40 ± 1.50	kJ/mol	NIST
ΔfusH°	2.54	kJ/mol	Joback Calculated Property
ΔvapH°	20.50 ± 0.30	kJ/mol	NIST
IE	[11.22; 11.33]	eV
IE	11.26 ± 0.03	eV	NIST
IE	11.22	eV	NIST
IE	11.28 ± 0.01	eV	NIST
IE	11.27	eV	NIST
IE	11.29	eV	NIST
IE	11.26	eV	NIST
IE	11.27 ± 0.00	eV	NIST
IE	11.28	eV	NIST
IE	11.28 ± 0.01	eV	NIST
IE	11.22 ± 0.01	eV	NIST
IE	11.29	eV	NIST
IE	11.29	eV	NIST
IE	Outlier 11.33	eV	NIST
IE	11.30	eV	NIST
log10WS	-0.88		Aq. Solubility Prediction
logPoct/wat	0.855		Crippen Calculated Property
McVol	37.190	ml/mol	McGowan Calculated Property
Pc	[6679.24; 7400.00]	kPa
Pc	6714.40 ± 0.67	kPa	NIST
Pc	6679.24 ± 4.05	kPa	NIST
Pc	6680.00 ± 202.65	kPa	NIST
Pc	7400.00 ± 303.98	kPa	NIST
Ptriple	[0.87; 0.87]	kPa
Ptriple	0.87 ± 0.00	kPa	NIST
Ptriple	0.87 ± 0.00	kPa	NIST
ρc	[362.98; 370.08]	kg/m3
ρc	362.98 ± 0.30	kg/m3	NIST
ρc	370.08 ± 5.05	kg/m3	NIST
Inp	[324.00; 340.00]
Inp	329.00		NIST
Inp	324.00		NIST
Inp	326.00		NIST
Inp	327.00		NIST
Inp	329.00		NIST
Inp	332.92		NIST
Inp	332.92		NIST
Inp	332.00		NIST
Inp	332.00		NIST
Inp	Outlier 340.00		NIST
Inp	332.00		NIST
Inp	326.00		NIST
Inp	332.00		NIST
Inp	332.00		NIST
Inp	332.00		NIST
S°liquid	140.08	J/mol×K	NIST
Tboil	[233.20; 249.75]	K
Tboil	248.97 ± 0.20	K	NIST
Tboil	249.39 ± 0.50	K	NIST
Tboil	249.45 ± 0.50	K	NIST
Tboil	249.45 ± 1.00	K	NIST
Tboil	249.15 ± 1.00	K	NIST
Tboil	249.00 ± 2.00	K	NIST
Tboil	249.75 ± 0.50	K	NIST
Tboil	Outlier 233.20 ± 1.50	K	NIST
Tboil	249.06 ± 0.40	K	NIST
Tc	[414.70; 416.27]	K
Tc	416.27 ± 0.02	K	NIST
Tc	416.25 ± 0.05	K	NIST
Tc	416.00 ± 3.00	K	NIST
Tc	416.00 ± 3.00	K	NIST
Tc	416.20 ± 0.50	K	NIST
Tc	Outlier 414.70 ± 2.00	K	NIST
Tfus	[175.55; 182.00]	K
Tfus	175.80	K	Aq. Solubility Prediction
Tfus	182.00 ± 1.50	K	NIST
Tfus	175.55 ± 0.40	K	NIST
Tfus	176.50 ± 0.50	K	NIST
Ttriple	[175.43; 175.44]	K
Ttriple	175.43 ± 0.07	K	NIST
Ttriple	175.44 ± 0.05	K	NIST
Ttriple	175.43 ± 0.07	K	NIST
Ttriple	175.44 ± 0.05	K	NIST
Vc	0.129	m3/kmol	Relay (1.0) Calculated Property

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	[39.03; 51.48]	J/mol×K	[259.71; 427.76]
Cp,gas	39.03	J/mol×K	259.71	Joback Calculated Property
Cp,gas	41.27	J/mol×K	287.72	Joback Calculated Property
Cp,gas	43.44	J/mol×K	315.73	Joback Calculated Property
Cp,gas	45.54	J/mol×K	343.74	Joback Calculated Property
Cp,gas	47.58	J/mol×K	371.75	Joback Calculated Property
Cp,gas	49.56	J/mol×K	399.76	Joback Calculated Property
Cp,gas	51.48	J/mol×K	427.76	Joback Calculated Property
Cp,liquid	[74.20; 83.85]	J/mol×K	[180.00; 310.00]
Cp,liquid	74.63	J/mol×K	180.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	74.33	J/mol×K	190.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	74.20	J/mol×K	200.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	74.23	J/mol×K	210.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	74.44	J/mol×K	220.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	74.81	J/mol×K	230.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	75.35	J/mol×K	240.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	75.60	J/mol×K	249.67	NIST
Cp,liquid	76.06	J/mol×K	250.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	76.94	J/mol×K	260.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	77.99	J/mol×K	270.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	78.35	J/mol×K	273.15	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	79.20	J/mol×K	280.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	80.59	J/mol×K	290.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	80.80	J/mol×K	293.15	NIST
Cp,liquid	81.20	J/mol×K	298.00	NIST
Cp,liquid	81.84	J/mol×K	298.15	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	82.14	J/mol×K	300.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
Cp,liquid	83.85	J/mol×K	310.00	Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD
η	[0.0001849; 0.0016364]	Pa×s	[130.95; 259.71]
η	0.0016364	Pa×s	130.95	Joback Calculated Property
η	0.0008810	Pa×s	152.41	Joback Calculated Property
η	0.0005526	Pa×s	173.87	Joback Calculated Property
η	0.0003840	Pa×s	195.33	Joback Calculated Property
η	0.0002868	Pa×s	216.79	Joback Calculated Property
η	0.0002258	Pa×s	238.25	Joback Calculated Property
η	0.0001849	Pa×s	259.71	Joback Calculated Property
ΔfusH	[6.42; 6.43]	kJ/mol	[174.50; 175.44]
ΔfusH	6.42	kJ/mol	174.50	NIST
ΔfusH	6.43	kJ/mol	174.50	NIST
ΔfusH	6.43	kJ/mol	175.44	NIST
ΔfusH	6.43	kJ/mol	175.44	NIST
ΔsubH	31.60 ± 0.10	kJ/mol	151.00	NIST
ΔvapH	[20.09; 23.50]	kJ/mol	[216.50; 392.00]
ΔvapH	22.70	kJ/mol	216.50	NIST
ΔvapH	23.50	kJ/mol	220.00	NIST
ΔvapH	22.60	kJ/mol	220.50	NIST
ΔvapH	22.60	kJ/mol	220.50	NIST
ΔvapH	22.00	kJ/mol	238.00	NIST
ΔvapH	21.54	kJ/mol	248.94	NIST
ΔvapH	21.54	kJ/mol	248.94	NIST
ΔvapH	22.00	kJ/mol	278.50	NIST
ΔvapH	20.09	kJ/mol	293.00	NIST
ΔvapH	20.10	kJ/mol	293.00	NIST
ΔvapH	21.00	kJ/mol	340.50	NIST
ΔvapH	21.80	kJ/mol	392.00	NIST
Pvap	[260.10; 870.90]	kPa	[273.10; 313.15]
Pvap	260.10	kPa	273.10	Vapor-Liquid Equilibria on Seven Binary Systems: Ethylene Oxide + 2-Methylpropane; Acetophenone + Phenol; cis-1,3-Dichloropropene + 1,2-Dichloropropane; 1,5-Hexadiene + Allyl Chloride; Isopropyl Acetate + Acetonitrile; Vinyl Chloride + Methyl Chloride; and 1,4-Butanediol + c-Butyrolactone
Pvap	870.90	kPa	313.15	Vapor-Liquid Equilibria on Seven Binary Systems: Ethylene Oxide + 2-Methylpropane; Acetophenone + Phenol; cis-1,3-Dichloropropene + 1,2-Dichloropropane; 1,5-Hexadiene + Allyl Chloride; Isopropyl Acetate + Acetonitrile; Vinyl Chloride + Methyl Chloride; and 1,4-Butanediol + c-Butyrolactone
ΔfusS	[36.66; 36.66]	J/mol×K	[175.44; 175.44]
ΔfusS	36.66	J/mol×K	175.44	NIST
ΔfusS	36.66	J/mol×K	175.44	NIST
ΔvapS	[86.51; 86.51]	J/mol×K	[248.94; 248.94]
ΔvapS	86.51	J/mol×K	248.94	NIST
ΔvapS	86.51	J/mol×K	248.94	NIST

Datasets

Specific volume, m3/kg

Fixed		Measured
Temperature, K - Liquid	Pressure, kPa - Liquid	Specific volume, m3/kg - Liquid
298.00	10000.00	0.0011
298.00	20000.00	0.0010
298.00	30000.00	0.0010
298.00	40000.00	0.0010
298.00	50000.00	0.0010
298.00	75000.00	0.0010
298.00	100000.00	0.0010
298.00	125000.00	0.0009
298.00	150000.00	0.0009
298.00	175000.00	0.0009
298.00	200000.00	0.0009
298.00	225000.00	0.0009
298.00	250000.00	0.0009
298.00	275000.00	0.0009
298.00	300000.00	0.0009
298.00	325000.00	0.0009
298.00	350000.00	0.0008
298.00	375000.00	0.0008
298.00	400000.00	0.0008
323.00	10000.00	0.0011
323.00	20000.00	0.0011
323.00	30000.00	0.0011
323.00	40000.00	0.0011
323.00	50000.00	0.0010
323.00	75000.00	0.0010
323.00	100000.00	0.0010
323.00	125000.00	0.0010
323.00	150000.00	0.0009
323.00	175000.00	0.0009
323.00	200000.00	0.0009
323.00	225000.00	0.0009
323.00	250000.00	0.0009
323.00	275000.00	0.0009
323.00	300000.00	0.0009
323.00	325000.00	0.0009
323.00	350000.00	0.0009
323.00	375000.00	0.0009
323.00	400000.00	0.0008
348.00	10000.00	0.0012
348.00	20000.00	0.0012
348.00	30000.00	0.0011
348.00	40000.00	0.0011
348.00	50000.00	0.0011
348.00	75000.00	0.0010
348.00	100000.00	0.0010
348.00	125000.00	0.0010
348.00	150000.00	0.0010
348.00	175000.00	0.0010
348.00	200000.00	0.0009
348.00	225000.00	0.0009
348.00	250000.00	0.0009
348.00	275000.00	0.0009
348.00	300000.00	0.0009
348.00	325000.00	0.0009
348.00	350000.00	0.0009
348.00	375000.00	0.0009
348.00	400000.00	0.0009
373.00	10000.00	0.0013
373.00	20000.00	0.0012
373.00	30000.00	0.0012
373.00	40000.00	0.0012
373.00	50000.00	0.0011
373.00	75000.00	0.0011
373.00	100000.00	0.0010
373.00	125000.00	0.0010
373.00	150000.00	0.0010
373.00	175000.00	0.0010
373.00	200000.00	0.0010
373.00	225000.00	0.0009
373.00	250000.00	0.0009
373.00	275000.00	0.0009
373.00	300000.00	0.0009
373.00	325000.00	0.0009
373.00	350000.00	0.0009
373.00	375000.00	0.0009
373.00	400000.00	0.0009
423.00	10000.00	0.0017
423.00	20000.00	0.0015
423.00	30000.00	0.0013
423.00	40000.00	0.0013
423.00	50000.00	0.0012
423.00	75000.00	0.0012
423.00	100000.00	0.0011
423.00	125000.00	0.0011
423.00	150000.00	0.0010
423.00	175000.00	0.0010
423.00	200000.00	0.0010
423.00	225000.00	0.0010
423.00	250000.00	0.0010
423.00	275000.00	0.0010
423.00	300000.00	0.0009
423.00	325000.00	0.0009
423.00	350000.00	0.0009
423.00	375000.00	0.0009
423.00	400000.00	0.0009
473.00	10000.00	0.0045
473.00	20000.00	0.0019
473.00	30000.00	0.0016
473.00	40000.00	0.0014
473.00	50000.00	0.0014
473.00	75000.00	0.0013
473.00	100000.00	0.0012
473.00	125000.00	0.0011
473.00	150000.00	0.0011
473.00	175000.00	0.0011
473.00	200000.00	0.0010
473.00	225000.00	0.0010
473.00	250000.00	0.0010
473.00	275000.00	0.0010
473.00	300000.00	0.0010
473.00	325000.00	0.0010
473.00	350000.00	0.0009
473.00	375000.00	0.0009
473.00	400000.00	0.0009
523.00	10000.00	0.0064
523.00	20000.00	0.0026
523.00	30000.00	0.0019
523.00	40000.00	0.0017
523.00	50000.00	0.0015
523.00	75000.00	0.0013
523.00	100000.00	0.0013
523.00	125000.00	0.0012
523.00	150000.00	0.0012
523.00	175000.00	0.0011
523.00	200000.00	0.0011
523.00	225000.00	0.0011
523.00	250000.00	0.0010
523.00	275000.00	0.0010
523.00	300000.00	0.0010
523.00	325000.00	0.0010
523.00	350000.00	0.0010
523.00	375000.00	0.0010
523.00	400000.00	0.0009
573.00	10000.00	0.0079
573.00	20000.00	0.0034
573.00	30000.00	0.0023
573.00	40000.00	0.0019
573.00	50000.00	0.0017
573.00	75000.00	0.0015
573.00	100000.00	0.0013
573.00	125000.00	0.0013
573.00	150000.00	0.0012
573.00	175000.00	0.0012
573.00	200000.00	0.0011
573.00	225000.00	0.0011
573.00	250000.00	0.0011
573.00	275000.00	0.0011
573.00	300000.00	0.0010
573.00	325000.00	0.0010
573.00	350000.00	0.0010
573.00	375000.00	0.0010
573.00	400000.00	0.0010
Reference

Correlations

Property	Value	Unit	Temperature (K)	Source
Pvap	[0.64; 4206.67]	kPa	[175.45; 376.25]	The Yaws Handbook of Vapor Pressure
Equation			ln(Pvp) = A + B/(T + C)
Coefficient A			1.43821e+01
Coefficient B			-2.04489e+03
Coefficient C			-3.75640e+01
Temperature range, min.			175.45
Temperature range, max.			376.25
Pvap	0.64	kPa	175.45	Calculated Property
Pvap	5.04	kPa	197.76	Calculated Property
Pvap	23.99	kPa	220.07	Calculated Property
Pvap	81.31	kPa	242.38	Calculated Property
Pvap	216.80	kPa	264.69	Calculated Property
Pvap	485.06	kPa	287.01	Calculated Property
Pvap	950.82	kPa	309.32	Calculated Property
Pvap	1682.85	kPa	331.63	Calculated Property
Pvap	2748.03	kPa	353.94	Calculated Property
Pvap	4206.67	kPa	376.25	Calculated Property

Similar Compounds

Find more compounds similar to Chloromethane.

Mixtures

• Hydrochloric acid + Chloromethane
• Chloromethane + Ethene, chloro-
• Chloromethane + Water
• Carbon dioxide + Chloromethane
• Oxygen + Chloromethane
• Argon + Chloromethane
• Nitrogen + Chloromethane
• Hydrogen + Chloromethane
• helium + Chloromethane

Sources

• Cheméo Relay (1.0)
• Crippen Method
• (Vapour + liquid) equilibria of {xCH3Cl + (1-x)HCl} at temperatures (159.01 and 182.33) K
• Vapor-Liquid Equilibria on Seven Binary Systems: Ethylene Oxide + 2-Methylpropane; Acetophenone + Phenol; cis-1,3-Dichloropropene + 1,2-Dichloropropane; 1,5-Hexadiene + Allyl Chloride; Isopropyl Acetate + Acetonitrile; Vinyl Chloride + Methyl Chloride; and 1,4-Butanediol + c-Butyrolactone
• Pressure-Volume-Temperature Properties of Methyl Chloride at High Pressures and Temperatures
• Determination of Henry's Law Constants Using Internal Standards with Benchmark Values
• Gas Solubilities (CO2, O2, Ar, N2, H2, and He) in Liquid Chlorinated Methanes
• Joback Method
• KDB
• Aqueous Solubility Prediction Method
• McGowan Method
• NIST Webbook
• The Yaws Handbook of Vapor Pressure
• Zabransky, M., Ruzicka, V., Majer, V. and Domalski, E. (1997), Heat Capacity of Liquids: Critical Review and Recommended Values - Monograph No. 6, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD

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