# Which Liquid is the Most Viscous

Which Liquid is the Most Viscous

Viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid’south ‘thickness’. For instance, dearest has a much higher viscosity than h2o. Viscosity is measured using a viscometer. Measured values span several orders of magnitude. Of all fluids, gases accept the lowest viscosities, and thick liquids have the highest.

The values listed in this article are representative estimates only, equally they exercise not account for measurement uncertainties, variability in material definitions, or non-Newtonian behavior.

## Viscosities at or near standard conditions

Hither “standard conditions” refers to temperatures of 25 °C and pressures of i atmosphere. Where data points are unavailable for 25 °C or 1 atmosphere, values are given at a nearby temperature/pressure.

The temperatures respective to each data signal are stated explicitly. By dissimilarity, force per unit area is omitted since gaseous viscosity depends merely weakly on it.

### Gases

#### Noble gases

The simple structure of noble gas molecules makes them amenable to accurate theoretical treatment. For this reason, measured viscosities of the noble gases serve as of import tests of the kinetic-molecular theory of send processes in gases (see Chapman–Enskog theory). Ane of the key predictions of the theory is the following relationship betwixt viscosity

${\displaystyle \mu }$

μ

{\displaystyle \mu }

, thermal conductivity

${\displaystyle k}$

k

{\displaystyle k}

, and specific heat

${\displaystyle c_{v}}$

c

5

{\displaystyle c_{v}}

:

${\displaystyle k=f\mu c_{v}}$

k
=
f
μ

c

v

{\displaystyle grand=f\mu c_{v}}

where

${\displaystyle f}$

f

{\displaystyle f}

is a constant which in full general depends on the details of intermolecular interactions, but for spherically symmetric molecules is very close to

${\displaystyle 2.5}$

two.5

{\displaystyle 2.5}

.[1]

This prediction is reasonably well-verified past experiments, as the following tabular array shows. Indeed, the relation provides a viable means for obtaining thermal conductivities of gases since these are more difficult to measure directly than viscosity.[1]
[2]

Substance Molecular

formula
Viscosity

(μPa·southward)
Thermal conductivity

(W m−1K−ane)
Specific estrus

${\displaystyle f\equiv k/(\mu c_{v})}$

f

g

/

(
μ

c

v

)

{\displaystyle f\equiv 1000/(\mu c_{five})}

Notes Refs.
Helium He 19.85 0.153 3116 two.47 [ii]
[3]
Neon Ne 31.75 0.0492 618 2.51 [2]
[3]
Argon Ar 22.61 0.0178 313 2.52 [2]
[iii]
Krypton Kr 25.38 0.0094 149 2.49 [ii]
[iii]
Xenon Xe 23.08 0.0056 95.0 ii.55 [2]
[3]
Radon Rn ≈26 ≈0.00364 56.ii T = 26.85 °C;

${\displaystyle k}$

g

{\displaystyle k}

calculated theoretically;

${\displaystyle \mu }$

μ

{\displaystyle \mu }

estimated assuming

${\displaystyle f=2.5}$

f
=
two.v

{\displaystyle f=2.five}

[4]

#### Diatomic elements

Substance Molecular formula Viscosity (μPa·s) Notes Ref.
Hydrogen H2 8.90 [5]
Nitrogen N2 17.76 [5]
Oxygen O2 20.64 [6]
Fluorine F2 23.sixteen [7]
Chlorine Cl2 13.forty [7]

#### Hydrocarbons

Substance Molecular formula Viscosity (μPa·s) Notes Ref.
Methane CH4 11.thirteen [viii]
Acetylene CtwoH2 ten.2 T = twenty °C [9]
Ethylene CtwoH4 x.28 [8]
Ethane C2H6 9.27 [viii]
Propyne C3H4 8.67 T = 20 °C [9]
Propene C3H6 eight.39 [10]
Propane C3H8 8.18 [8]
Butane CfourH10 vii.49 [8]

#### Organohalides

Substance Molecular formula Viscosity (μPa·s) Notes Ref.
Carbon tetrafluoride CF4 17.32 [11]
Fluoromethane CH3F 11.79 [12]
Difluoromethane CH2F2 12.36 [12]
Fluoroform CHF3 fourteen.62 [12]
Pentafluoroethane C2HFfive 12.94 [12]
Hexafluoroethane C2F6 14.00 [12]
Octafluoropropane C3F8 12.44 [12]

#### Other gases

Substance Molecular formula Viscosity (μPa·s) Notes Ref.
Air eighteen.46 [6]
Ammonia NHthree 10.07 [thirteen]
Nitrogen trifluoride NF3 17.11 T = 26.85 °C [14]
Boron trichloride BCl3 12.3 Theoretical estimate at T = 26.85 °C;
estimated uncertainty of 10%
[14]
Carbon dioxide CO2 fourteen.90 [15]
Carbon monoxide CO 17.79 [16]
Hydrogen sulfide H2Southward 12.34 [17]
Nitric oxide NO eighteen.90 [7]
Nitrous oxide NiiO 14.90 [18]
Sulfur dioxide And so2 12.82 [ten]
Sulfur hexafluoride SF6 xv.23 [five]
Molybdenum hexafluoride MoF6 14.v Theoretical estimates at T = 26.85 °C [19]
Tungsten hexafluoride WFsix 17.one
Uranium hexafluoride UF6 17.4

### Liquids

#### due north-Alkanes

Substances composed of longer molecules tend to have larger viscosities due to the increased contact of molecules beyond layers of flow.[20]
This effect can exist observed for the n-alkanes and 1-chloroalkanes tabulated below. More dramatically, a long-chain hydrocarbon like squalene (C30H62) has a viscosity an club of magnitude larger than the shorter n-alkanes (roughly 31 mPa·s at 25 °C). This is also the reason oils tend to exist highly mucilaginous, since they are usually composed of long-chain hydrocarbons.

Substance Molecular formula Viscosity (mPa·s) Notes Ref.
Pentane CfiveH12 0.224 [21]
Hexane C6H14 0.295 [22]
Heptane C7Hxvi 0.389 [22]
Octane C8H18 0.509 [22]
Nonane C9H20 0.665 [21]
Decane C10H22 0.850 [22]
Undecane CelevenH24 1.098 [21]
Dodecane C12H26 ane.359 [22]
Tridecane CthirteenH28 1.724 [21]
Pentadecane CxvH32 2.82 T = 20 °C [23]
Heptadecane C17H36 four.21 T = xx °C [24]

#### i-Chloroalkanes

Substance Molecular formula Viscosity (mPa·south) Notes Ref.
Chlorobutane CivH9Cl 0.4261 [25]
Chlorohexane C6H11Cl 0.6945
Chlorooctane C8H17Cl 1.128
Chlorodecane CtenH21Cl 1.772
Chlorododecane C12H25Cl ii.668

#### Other halocarbons

Substance Molecular formula Viscosity (mPa·southward) Notes Ref.
Dichloromethane CHtwoCl2 0.401 [26]
Trichloromethane

(chloroform)
CHCliii 0.52 [ten]
Tribromomethane

(bromoform)
CHBr3 1.89 [27]
Carbon tetrachloride CClfour 0.86 [27]
Trichloroethylene C2HClthree 0.532 [28]
Tetrachloroethylene CtwoCl4 0.798 T = 30 °C [28]
Chlorobenzene C6H5Cl 0.773 [29]
Bromobenzene C6HfiveBr one.080 [29]
one-Bromodecane C10H21Br 3.373 [30]

#### Alkenes

Substance Molecular formula Viscosity (mPa·south) Notes Ref.
2-Pentene C5Hx 0.201 [31]
1-Hexene Chalf dozenH12 0.271 [32]
1-Heptene C7Hxiv 0.362 [32]
one-Octene C8H16 0.506 T = xx °C [31]
ii-Octene C8H16 0.506 T = 20 °C [31]
n-Decene C10H20 0.828 T = 20 °C [31]

#### Other liquids

Substance Molecular formula Viscosity (mPa·s) Notes Ref.
Acetic acid C2H4O2 one.056 [21]
Acetone CiiiHhalf dozenO 0.302 [33]
Benzene C6Hvi 0.604 [21]
Bromine Brii 0.944 [21]
Ethanol CtwoH6O 1.074 [21]
Glycerol C3H8O3 1412 [34]
Hydrazine HivN2 0.876 [21]
Iodine pentafluoride IFfive 2.111 [35]
Mercury Hg 1.526 [21]
Methanol CHfourO 0.553 [36]
1-Propanol (propyl alcohol) C3H8O 1.945 [37]
two-Propanol (isopropyl alcohol) C3HviiiO 2.052 [37]
Squalane C30H62 31.123 [38]
Water H2O 1.0016 T = 20 °C, standard force per unit area [21]

### Aqueous solutions

The viscosity of an aqueous solution can either increment or decrease with concentration depending on the solute and the range of concentration. For instance, the table below shows that viscosity increases monotonically with concentration for sodium chloride and calcium chloride, just decreases for potassium iodide and cesium chloride (the latter upwards to 30% mass percentage, after which viscosity increases).

The increase in viscosity for sucrose solutions is particularly dramatic, and explains in function the common experience of sugar water being “sticky”.

Table: Viscosities (in mPa·s) of aqueous solutions at T = 20 °C for various solutes and mass percentages[21]
Solute mass pct = 1% ii% iii% four% 5% 10% xv% 20% 30% xl% 50% lx% 70%
Sodium chloride (NaCl) i.020 ane.036 1.052 1.068 one.085 1.193 ane.352 ane.557
Calcium chloride (CaCltwo) 1.028 1.050 1.078 1.110 ane.143 one.319 1.564 1.930 iii.467 8.997
Potassium iodide (KI) 0.997 0.991 0.986 0.981 0.976 0.946 0.925 0.910 0.892 0.897
Cesium chloride (CsCl) 0.997 0.992 0.988 0.984 0.980 0.966 0.953 0.939 0.922 0.934 0.981 1.120
Sucrose (C12H22O11) 1.028 one.055 1.084 1.114 i.146 1.336 1.592 ane.945 3.187 six.162 15.431 58.487 481.561

### Substances of variable composition

Substance Viscosity (mPa·s) Temperature (°C) Reference
Whole milk ii.12 20 [39]
Olive oil 56.2 26 [39]
Canola oil 46.2 30 [39]
Sunflower oil 48.8 26 [39]
Love

${\displaystyle \approx }$

{\displaystyle \approx }

2000-10000

20 [40]
Ketchup[a]

${\displaystyle \approx }$

{\displaystyle \approx }

5000-20000

25 [41]
Peanut butter[a]

${\displaystyle \approx }$

{\displaystyle \approx }

ten4-ten6

[42]
Pitch
two.3×1011
ten-30 (variable) [43]
1. ^

a

b

These materials are highly non-Newtonian.

## Viscosities nether nonstandard conditions

### Gases

Pressure level dependence of the viscosity of dry air at 300, 400 and 500 kelvins

All values are given at i bar (approximately equal to atmospheric pressure).

Substance Chemical formula Temperature (K) Viscosity (μPa·southward)
Air 100 vii.1
200 xiii.3
300 18.five
400 23.1
500 27.1
600 30.8
Ammonia NH3 300 x.2
400 14.0
500 17.ix
600 21.vii
Carbon dioxide CO2 200 10.ane
300 15.0
400 xix.seven
500 24.0
600 28.0
Helium He 100 9.half-dozen
200 15.1
300 19.nine
400 24.iii
500 28.iii
600 32.2
Water vapor HtwoO 380 12.498
400 xiii.278
450 15.267
500 17.299
550 19.356
600 21.425
650 23.496
700 25.562
750 27.617
800 29.657
900 33.680
grand 37.615
1100 41.453
1200 45.192

### Liquids (including liquid metals)

Viscosity of h2o equally a function of temperature

Substance Chemical formula Temperature (°C) Viscosity (mPa·s)
Mercury[44]
[45]
Hg -thirty 1.958
-20 1.856
-10 1.766
0 1.686
x one.615
20 1.552
25 1.526
30 1.495
l 1.402
75 one.312
100 1.245
126.85 one.187
226.85 i.020
326.85 0.921
Ethanol CtwoH6O -25 iii.26
0 1.786
25 1.074
50 0.694
75 0.476
Bromine Br2 0 1.252
25 0.944
l 0.746
Water H2O 0.01 1.7911
10 1.3059
twenty 1.0016
25 0.89002
xxx 0.79722
twoscore 0.65273
50 0.54652
60 0.46603
70 0.40355
80 0.35405
90 0.31417
99.606 0.28275
Glycerol CiiiH8O3 25 934
50 152
75 39.8
100 14.76
Aluminum Al 700 ane.24
800 one.04
900 0.90
Golden Au 1100 5.130
1200 4.640
1300 4.240
Copper Cu 1100 3.92
1200 3.34
1300 2.91
1400 2.58
1500 ii.31
1600 2.10
1700 ane.92
Silver Ag 1300 3.75
1400 3.27
1500 2.91
Iron Iron 1600 five.22
1700 4.41
1800 3.79
1900 3.31
2000 2.92
2100 2.60

In the post-obit table, the temperature is given in kelvins.

Substance Chemical formula Temperature (K) Viscosity (mPa·s)
Gallium[45] Ga 400 i.158
500 0.915
600 0.783
700 0.700
800 0.643
Zinc[45] Zn 700 3.737
800 two.883
900 two.356
m 2.005
1100 1.756
700 2.043
800 1.654
900 1.403

### Solids

Substance Viscosity (Pa·south) Temperature (°C)
granite[46]
3×10nineteen

6×1019
25
asthenosphere[47]
7.0×tennineteen
900
upper mantle[47]
7×1020

i×1021
1300–3000
lower mantle[
commendation needed
]

1×1021

2×1021
3000–4000

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## Which Liquid is the Most Viscous

Source: https://en.wikipedia.org/wiki/List_of_viscosities

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