هیدر-ایستاییک، هیدر-ایستا hidristâik
*Fr.: hydrostatique*
Of or pertaining to → *hydrostatics*. → *hydro-* + → *static*. |

هموگش ِ هیدر-ایستاییک hamugeš-e hidristâik
*Fr.: équation hydrostatique*
The equation describing the → *hydrostatic equilibrium*
in a star, expressed as: *dP/dr = -GMρ/r*^{2}, where
*P* and *M* are the mass and pressure of a spherical shell with thickness *dr*
at some distance *r* around the center of the star, ρ is
the density of the gas, and *G* the → *gravitational constant*. → *hydrostatic*; → *equation*. |

ترازمندی ِ هیدر-ایستاییک، ~ هیدر-ایستا tarâzmandi-ye hidristâik
*Fr.: équilibre hydrostatique*
1) The physical situation reached in a fluid when complete balance exists between
the internal pressure at any point and the weight of the material above the point.
2) For a star, the balance between the inward → *gravitational force*
and the outward gas pressure everywhere in the star.
→ *hydrostatic equation*. See also
→ *hydrodynamic equilibrium*. → *hydrostatic*; → *equilibrium*. |

هالهی ِ هیدر-ایستا hâle-ye hidristâ
*Fr.: halo hydrostatique*
A model of the → *Milky Way galaxy*
in which the → *Galactic halo* (composed of
→ *gas*, → *magnetic field*s, and
→ *cosmic ray*s) is assumed to be
in → *hydrostatic equilibrium*.
Parker (1966) presented the first study of stability considerations
between gas, magnetic fields and cosmic rays in an equilibrium
configuration. He found that it is difficult to maintain a
stable configuration due to magnetohydrodynamic self-attraction
(→ *Parker instability*).
Subsequent works taking into account turbulent motions showed that
turbulent pressure can mitigate the influence of Parker instabilities. This enabled new
attempts to find conditions under which a stable equilibrium configuration
of the Galaxy could exist. → *hydrostatic*; → *halo*. |

فشار ِ هیدروتوانیک fešâr-e hidrotavânik
*Fr.: pression hydrodynamique*
The term ρ*gz* in the → *Bernoulli equation*.
It is not pressure in a real sense, because its value depends on the
reference level selected. → *hydrostatic*; → *pressure*. |

هیدر-ایستاییک hidristâyik
*Fr.: hydrostatique*
A branch of physics that deals with the characteristics of → *fluid*s
at rest and especially with the pressure in a fluid or exerted by a fluid
on an immersed body. → *hydro-* + → *statics*. |