# 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: 4 Search : pascal
 pascal (Pa)   پاسکال   pâskâl (#)Fr.: pascal   The → SI unit of → pressure, that of one → newton per → square → meter. Since 1 Pa is a small pressure, hPa (→ hectopascals) are more widely used. 1 Pa = 10 dyn cm-2, = 1.02 x 10-5 kgf cm-2 = 10-5 bars = 9.87 x 10-6 atm = 7.50 x 10-3 torr (mm Hg).In honor of Blaise Pascal (1623-1662), French mathematician, physicist, and religious philosopher for his contribution in the study of hydrodynamics and hydrostatics, in particular establishing the principle of the barometer. Pascal's barrel experiment   آزمایش ِ چلیک ِ پاسکال   âzmâyeš-e celik-e PascalFr.: expérience du tonneau de Pascal   An experiment carried out by Blaise Pascal in 1646 to demonstrate the hydraulic pressure. A long and narrow vertical pipe was connected to the content of a closed wooden barrel already full of water. He poured a small quantity of water into the pipe, whereby the height of the fluid within the pipe sharply increased. Due to the increase in hydrostatic pressure and → Pascal's law, the barrel could leak and even burst.→ pascal (Pa); M.E. barel, from M.Fr. baril, O.Fr. barril; → experiment Pascal's law   قانون ِ پاسکال   qânun-e pâskâl (#)Fr.: loi de Pascal   A change in the pressure of an enclosed incompressible fluid is conveyed undiminished to every part of the fluid and to the surfaces of its container.Named after Blaise Pascal (1623-1662), French mathematician, physicist, and religious philosopher for his contribution in the study of hydrodynamics and hydrostatics, in particular establishing the principle of the barometer. Pascal's triangle   سه‌بر ِ پاسکال   sebar-e PascalFr.: triangle de Pascal   An array of numbers in the shape of a triangle, having a 1 at the top and also at the ends of each row. Each number is obtained by summing the two adjacent numbers to it in the preceding row. Each row is a set of → binomial coefficients. In the expansion of (x + y)n, the coefficients of x and y are given by the n-th row of Pascal's traingle.→ pascal; → triangle.