This time we are looking on the crossword puzzle clue for: Source of 20s.
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Last seen on: Universal Crossword – Oct 12 2021 n
Random information on the term “ATM”:
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth’s average atmospheric pressure at sea level.
The standard atmosphere was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (gn = 9.80665 m/s2). It was used as a reference condition for physical and chemical properties, and was implicit in the definition of the centigrade scale of temperature, which defined 100 °C as the boiling point of water at this pressure. In 1954, the 10th General Conference on Weights and Measures (CGPM) adopted standard atmosphere for general use and affirmed its definition of being precisely equal to 1013250 dynes per square centimetre (101325 Pa). This defined both temperature and pressure independent of the properties of particular substance. In addition, the CGPM noted that there had been some misapprehension that it “led some physicists to believe that this definition of the standard atmosphere was valid only for accurate work in thermometry.”