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  2. Humidity - Wikipedia

    en.wikipedia.org/wiki/Humidity

    So changing the temperature of air can change the relative humidity, even when the absolute humidity remains constant. Chilling air increases the relative humidity. If the relative humidity rises over 100% (the dew point) and there is an available surface or particle, the water vapour will condense into liquid or ice. Likewise, warming air ...

  3. Moisture sorption isotherm - Wikipedia

    en.wikipedia.org/wiki/Moisture_sorption_isotherm

    The relationship between water content and equilibrium relative humidity of a material can be displayed graphically by a curve, the so-called moisture sorption isotherm. For each humidity value, a sorption isotherm indicates the corresponding water content value at a given temperature. If the composition or quality of the material changes, then ...

  4. Water activity - Wikipedia

    en.wikipedia.org/wiki/Water_activity

    Using this particular definition, pure distilled water has a water activity of exactly one. Water activity is the thermodynamic activity of water as solvent and the relative humidity of the surrounding air after equilibration. As temperature increases, a w typically increases, except in some products with crystalline salt or sugar.

  5. Lifting condensation level - Wikipedia

    en.wikipedia.org/wiki/Lifting_condensation_level

    Schematic of the LCL in relation to the temperature (T) and dew point and their altitude (Z); the moist adiabatic temperature curve above the LCL is also sketched for reference The lifting condensation level or lifted condensation level ( LCL ) is the height at which the relative humidity (RH) of an air parcel will reach 100% with respect to ...

  6. Water vapor - Wikipedia

    en.wikipedia.org/wiki/Water_vapor

    The vapor content of air is measured with devices known as hygrometers. The measurements are usually expressed as specific humidity or percent relative humidity. The temperatures of the atmosphere and the water surface determine the equilibrium vapor pressure; 100% relative humidity occurs when the partial pressure of water vapor is equal to ...

  7. Atmospheric thermodynamics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_thermodynamics

    Atmospheric thermodynamics is the study of heat-to-work transformations (and their reverse) that take place in the Earth's atmosphere and manifest as weather or climate. . Atmospheric thermodynamics use the laws of classical thermodynamics, to describe and explain such phenomena as the properties of moist air, the formation of clouds, atmospheric convection, boundary layer meteorology, and ...

  8. Properties of water - Wikipedia

    en.wikipedia.org/wiki/Properties_of_water

    A saturated gas or one with 100% relative humidity is when the vapor pressure of water in the air is at equilibrium with vapor pressure due to (liquid) water; water (or ice, if cool enough) will fail to lose mass through evaporation when exposed to saturated air.

  9. Weather - Wikipedia

    en.wikipedia.org/wiki/Weather

    Weather refers to day-to-day temperature, precipitation, and other atmospheric conditions, whereas climate is the term for the averaging of atmospheric conditions over longer periods of time. [4] When used without qualification, "weather" is generally understood to mean the weather of Earth.