# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 28 Search : pressure
 sound pressure   فشار ِ صدا   fešâr-e sedâFr.: pression de son   The periodic fluctuation above and below atmospheric pressure created by an oscillating body which provides the → sound power. Instantaneous sound pressure is the peak value of air pressure.→ sound; → pressure. stagnation pressure   فشار ِ ناروانی   fešâr-e nâravâniFr.: pression de stagnation   The sum of → static pressure and → dynamic pressure in the → Bernoulli equation.→ stagnation; → pressure. standard temperature and pressure (STP)   دما و فشار ِ استانده   damâ o fešâr-e estândéFr.: conditions normales de température et de pression   1) The most commonly used definition is temperature of 273.15 K (0 °C) and pressure of 1 → atmosphere. 2) Chemistry: Temperature of 273.15 K (0 °C) and pressure of 105  → pascal (Pa)s (1 → bar). International Union of Pure and Applied Chemistry (IUPAC) recommends that the former use of the pressure of 1 atm as standard pressure (equivalent to 1.01325 × 105 Pa) should be discontinued.→ standard; → temperature; → pressure. static pressure   فشار ِ ایستا   fešâr-e istâFr.: pression statique   In → fluid mechanics, the → pressure felt by an object suspended in a → fluid and moving with it. This pressure is called static because the object is not moving relative to the fluid. See also → dynamic pressure.→ static; → pressure. thermal pressure   فشار ِ گرمایی   fešâr-e garmâyi (#)Fr.: pression thermale   The ordinary pressure in a gas that is due to motions of particles and can be attributed to the object's → temperature.→ thermal; → pressure. total pressure   فشار ِ هماک   fešâr-e hamâkFr.: pression totale   The sum of → static pressure, → dynamic pressure, and → hydrostatic pressure in the → Bernoulli equation.→ total, → pressure. vapor pressure   فشار ِ بخار   fešâr-e boxârFr.: pression de vapeur   The equilibrium pressure of a vapor above its condensed phases (liquid or solid). In other words, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container. The vapor pressure varies with the temperature. As the temperature increases its the vapor pressure also increases, and conversely. The temperature at which the vapor pressure is equal to the atmospheric pressure is called the → boiling point. For example, at 20 °C, water would boil at a pressure of about 0.023 atm, or about a fortieth of atmospheric pressure.→ vapor; → pressure. velocity pressure   فشار ِ توانیک   fešâr-e tavânikFr.: pression dynamique   → velocity; → pressure.

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