Water Properties Calculator
by
K. Caleb Wang, PhD
Guidelines
Input
: calculations will be made when a change is entered or the
Calculate
button is clicked
Output
: unit conversion can be made by selecting different units in pulldown menus
Temperature range: 0~100 [°C] (liquid water at 1 atm)
Dilute solution is assumed for osmotic pressure calculations
Input
Temperature
[°C]
[°F]
Solute, x
2
mole fraction
mtwm
Output Digits
5
4
3
(significant digits)
Property Relations
α = k/(ρC
p
)
ν = μ/ρ
P
osm
v
1
= x
2
RT
v
1
: solvent molar volume
x
2
: solute mole fraction, assuming dilute solution with x
2
« 1
(from Ref. 4)
M
ean
t
ap
w
ater
m
ineral content⁵,
mtwm
x
2
= 107×10
-6
mole fraction= 1 mtwm
(i.e. 82mg-mineral/1000g-water (≡ 82 ppm by weight); see Ref. 5:
Ca 3.0mg, Mg 0.9mg, Na 3.8mg, K 0.5mg, per 100g tap water)
Output
Density¹, ρ
[kg/m³]
[lbm/ft³]
Specific Heat¹, C
p
[J/kg.K]
[BTU/lbm.F]
[cal/g.C]
Conductivity¹, k
[W/m.K]
[BTU/h.ft.F]
Thermal Diffusivity¹, α
[m²/s]
[ft²/hr]
Dynamic Viscosity¹, μ
[kg/m.s]
[lbm/ft.h]
[lbf.h/ft²]
Kinematic Viscosity¹, ν
[m²/s]
[ft²/hr]
[stokes]
[ft²/s]
Hydrogen Bonds², N
HB
(average #)
Surface Tension³, σ
[x10⁻³N/m]
[x10⁻³lbf/ft]
Osmotic Pressure⁴, P
osm
[Pa]
[psi]
[atm]
Thermal Expansion Coefficient, β
[1/K]
[1/R]
Prandtl number, Pr
References
Thermophysical properties (
ρ
,
C
p
,
k
,
α
,
μ
,
ν
): MHTL, Univ of Waterloo
. Density calculations are based on a curve-fit formula to give approximated values without catching the 4°C maximum.
Number of hydrogen bonds (
N
HB
): Wang's paper
Surface Tension (
σ
) of Ordinary Water: IAPWS
Osmotic pressure (
P
osm
): Wang's class notes at UIUC
Mineral content: ARS, USDA
Water
Air