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Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.
Standard sea-level conditions (SSL), [1] also known as sea-level standard (SLS), defines a set of atmospheric conditions for physical calculations.The term "standard sea level" is used to indicate that values of properties are to be taken to be the same as those standard at sea level, and is done to define values for use in general calculations.
In chemistry, IUPAC changed its definition of standard temperature and pressure in 1982: [1] [2] Until 1982, STP was defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 atm (101.325 kPa).
Standard of living is the level of income, comforts and services available to an individual, community or society.A contributing factor to an individual's quality of life, standard of living is generally concerned with objective metrics outside an individual's personal control, such as economic, societal, political, and environmental matters. [1]
Furthermore, it has been written down in article 11 of the United Nations' International Covenant on Economic, Social and Cultural Rights. The predecessor of this right, the Freedom from Want, is one of the Four Freedoms that American President Franklin D. Roosevelt spoke out at his State of the Union of January 6, 1941.