humidity, definition of

Humidity is a term for the amount of water vapor in the air, and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the Absolute humidity. In everyday usage, it commonly refers to relative humidity, expressed as a percent in weather forecasts and on household humidistat's; it is so called because it measures the current absolute humidity relative to the maximum. Specific humidity is a ratio of the water vapor content of the mixture to the dry air content (on a mass basis). The water vapor content of the mixture can be measured either as mass per volume or as a partial pressure, depending on the usage.

In meteorology, humidity indicates the likelihood of precipitation, dew, or fog. High relative humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. This effect is calculated in a heat index table, used during summer weather.

• What is Climate?
  We ask: what is climate? and how we experience the climate effects how we think about it.
• Home Ventilation Techniques
  Home Ventilation improves the quality of living in your home, we look at the ventilation system options available.
• Mould Prevention, do it yourself tips
  Preventing mould in your house without using expensive chemicals or solutions, managing it the DIY way.
• Ecologically Sustainable Development, what it is and how you can do it
  Ecologically Sustainable Development (ESD) is defined and explained in detail in this article; and how it helps you to be more green and eco friendly.
• What is a Trombe Wall and how can you use one?
  Trombe Walls can provide free heating, cooling and ventilation. We explain how Trombe Walls work; how to build a Trombe Wall and how such a wall saves money by reducing energy usage.
• Low Allergen Building Design
  Low allergen design is a whole building approach that aims to reduce and avoid all known allergens, and to minimize the conditions in which they occur. This article shows you how.
• What is Passive Solar?
  Passive solar building design is explained and how passive solar principals are used to design green homes and buildings, and save you money.
• Keeping your home Cool in Summer or Warm in Winter for free!
  How to keep cool or warm in your home by design, either in Summer or Winter, whilst reducing costs to you and the Earth..

• Lets the climate models tell the truth we want to see..
  Climate models are just that, a model, based on assumptions and theories. Their accuracy is limited not only through the complexities of the climatic systems they model but also by the conclusions researchers want to see from them..

• Bizarre messianic speech from billionaire Andrew Forrest: The hidden deadly (non) threat of Lethal Humidity
  Andrew Forrest speaks of the deaths of millions coming soon… By Jo Nova The cult doomer prophesy upgrades to Billionaire Class. Put this man out of his misery. Andrew Forrest, Executive Chairman of a $60 billion company made a bizarre speech a few...
• A greenhouse is transformed into an experimental living space in Taiwan
  Taipei-based design practice BIAS Architects recently completed “Greenhouse as a Home,” an experimental installation that reinterprets the living areas of a traditional house as five climatic zones...
• How corn sweat is making this weeks heat wave even worse
  Right now, there is one burning question on your mind, and I know it’s “What the heck is corn sweat?” The week’s extreme heat wave is blistering the middle section of the United States, where excess moisture from corn fields will evaporate and...

Related Tags: humidity, house