Kinematic viscosity
nu = mu / rho
Dynamic viscosity divided by density
Water property lookup
Properties of Water at Room Temperature
Search common water properties at 25 C for quick laboratory, fluid mechanics, heat transfer, and engineering reference.
Instant lookup
Search a room-temperature property
Type a property name such as density, viscosity, vapor pressure, or surface tension to surface the matching 25 C reference values.
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Reference table
Water properties at 25 C and 1 atm
| Property | SI Units | Metric Units | Imperial Units |
|---|---|---|---|
| Density | 997 kg/m3 | 0.997 g/cm3 | 62.2 lb/ft3 |
| Dynamic Viscosity | 0.89 mPa.s | 0.00089 Pa.s | 0.00183 lb/(ft.hr) |
| Kinematic Viscosity | 0.893 x 10^-6 m2/s | 0.893 cSt | 0.987 x 10^-5 ft2/s |
| Specific Heat Capacity Cp | 4.18 kJ/kg.K | 1 cal/g.C | 1.0 Btu/lb.F |
| Thermal Conductivity | 0.6 W/m.K | 0.6 W/m.K | 3.34 Btu.ft/(hr.ft2.F) |
| Vapor Pressure | 3.17 kPa | 23.8 mmHg | 0.462 psi |
| Surface Tension | 0.072 N/m | 72 mN/m | 0.516 lb/ft |
| Refractive Index | 1.333 | 1.333 | 1.333 |
| pH | 7 | 7 | 7 |
| Freezing Point | 0 C | 0 C | 32 F |
| Boiling Point | 100 C | 100 C | 212 F |
| Dielectric Constant | 78.5 | 78.5 | 78.5 |
Formulas
Useful water property relationships
Sensible heat
Q = m cp Delta T
Heating or cooling energy for liquid water
Room-temperature water properties are used for quick checks, lab setup, calibration, introductory calculations, and estimates where 25 C liquid water is an acceptable reference state.
Reference
What the water property values mean
Density
Mass per unit volume, used for buoyancy, mass flow, hydrostatic pressure, and hydraulic calculations.
Viscosity
Resistance to flow, used for Reynolds number, pressure drop, pump sizing, and pipe flow estimates.
Specific heat
Heat required to raise water temperature, used for heating, cooling, and energy storage calculations.
Vapor pressure
Equilibrium pressure of water vapor, used for boiling, evaporation, cavitation, and phase-change checks.
FAQ
Water property questions
What is meant by room temperature water?
This page uses 25 C and 1 atm as the room-temperature reference condition.
What is the density of water at room temperature?
At 25 C, the density of water is approximately 997 kg/m3, or 0.997 g/cm3.
When should I use the full water property table instead?
Use the full 1 atm water property table when temperature differs from 25 C or when multiple temperature-dependent properties are needed.
Related
Water property tables
Density of Water
Water density values across practical temperatures.
Dynamic Viscosity of Water
Dynamic viscosity values for water.
Kinematic Viscosity of Water
Kinematic viscosity values for water.
Properties of Water at Standard Pressure
Water properties at atmospheric pressure.
Specific Heat of Water
Specific heat values for water.