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Water critical parameters : [Dincer]
Water triple point parameters : [Dincer]
How does the density of liquid water vary with temperature ?
What is the equation to calculate the density of water ?
ρ=0.14395/(0.0112^[1+(1-T/649.727)^0.05107]) [DDB]
With
ρ = density (kg/m3)
T = temperature (K)
A = 0.14395
B = 0.0112
C = 649.727
D = 0.05107
Range of validity : [273 ; 648] K
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How does the viscosity of liquid water vary with temperature ? What is the equation to calculate the viscosity of water ?
μ = exp(-3.7188+578.919/(-137.546+T))
With
μ = viscosity (mPa.s)
T = temperature (K)
A = -3.7188
B = 578.919
C = -137.546
Range of validity : [273 ; 373] K
How does the thermal conductivity of liquid water vary with temperature ? What is the equation to calculate the thermal conductivity of water ?
λ'=-1.48445+4.12292*T'-1.63866*T'2 [NIST]
With
λ' = λ(T)/λ(298.15)
λ(298.15) = 0.6065 W.m-1.K-1
λ(T) = thermal conductivity of water at temperature T (W.m-1.K-1)
T' = T/298.15
T = temperature of water (K)
Range of validity : [274 ; 370] K
How does the vapor pressure of water vary with temperature ? What is the equation to calculate the vapor pressure of water ?
log(Ps) = 8.07131 - 1730.63 / (233.426 + T)
With
Ps = Saturation pressure (mmHg) - note, to switch to Pa, multiply by 133.322 Pa/mmHgYou can access an Excel tool to apply the formula detailed above and make calculations. This tool contains :