In the case of solids and liquids, the change in density is typically low. Note that density is also affected by pressure and temperature. It is useful to carefully write out whatever values are being worked with, including units, and perform dimensional analysis to ensure that the final result has units of mass There are many different ways to express density, and not using or converting into the proper units will result in an incorrect value. However, it is important to pay special attention to the units used for density calculations. See Water - Enthalpy and Entropy for tabulated values in different units.Įnthalpy of water (liquid and vapor) as function of temperature (☌ and ☏):The calculation of density is quite straightforward. Specific entropy of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Thermal Diffusivity for variations at constant pressures. Thermal diffusivity of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Prandtl Number for variations at constant pressures. Prandtl number of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Thermal Conductivity for variations at constant pressures. Thermal conductivity of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Specific heat (heat capacity) for calculator of heat capacity at given temperatures. Specific heat (heat capacity) of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Density, Specific Weight and Thermal Expantion Coefficient for calculator and variations at constant pressures. See Water - Dynamic and Kinematic Viscosity for calculator and variations at constant pressures.ĭensity of water (liquid and vapor) as function of temperature (☌ and ☏): See Water - Saturation pressure for calculator of equilibrium pressure at varying temperature.ĭynamic viscosity of water (liquid and vapor) as function of temperature (☌ and ☏): Vapor pressure of water as function of temperature (☌ and ☏): See also these and other properties of Water at varying temperature and pressure : Boiling points at high pressure, Boiling points at vacuum pressure, Density and specific weight, Dynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pK w, of normal and heavy water, Melting points at high pressure, Prandtl number, Properties at Gas-Liquid Equilibrium Conditions, Saturation pressure, Specific gravity, Specific heat (heat capacity), Specific volume, Thermal conductivity, Thermal diffusivity and Vapour pressure at gas-liquid equilibrium. See Water and Heavy Water for thermodynamic properties at standard condtions. Tabulated values are given below the figures, in SI and Imperial units. The figures show liquid and gaseous states at equilibrium as a function of temperature, starting at the triple point and ending at the critical temperature. The figures and tables below summarize the thermophysical properties of water and steam at equilibrium. At this equilibrium condition the vapor pressure is the saturation pressure. At higher pressures water would condense. The vapor pressure of water is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state. If the space is confined the partial pressure exerted by the molecules increases until the rate at which molecules reenter the liquid is equal to the rate at which they leave. Water tends to evaporate or vaporize by projecting molecules into the space above its surface.

Density of water vapor in kgm3