Fr.: zéro absolu
The → zero point of the → Kelvin scale of → temperature; the theoretical point at which all molecular activity ceases, -273.16 °C.
Fr.: non zéro, non nul
Not equal to zero.
Fr.: polynôme non nul
A → polynomial that at least has one non-zero → coefficient. See also → zero polynomial.
→ non-zero; → polynomial.
1) The cardinal number of a class that has no members.
From Fr. zéro, from It. zero, from M.L. zephirum, from Ar.
zero age horizontal branch star (ZAHB)
setâre-ye šâxe-ye ofoqi bâ senn-e sefr
Fr.: étoile de la branche horizontale d'âge zéro
A star that has arrived on the → horizontal branch after leaving the → red giant branch. It begins → helium burning in its core.
→ zero; → age; → horizontal; → branch; → star.
zero age main sequence (ZAMS)
rešte-ye farist bâ senn-e sefr
Fr.: séquence principale d'âge zéro
The position on the → Hertzsprung-Russell diagram for newborn stars which have just started → hydrogen burning in their cores. The ZAMS forms the lower luminosity boundary of of the → main sequence strip. See also → terminal age main sequence (TAMS).
→ zero; → age; → main sequence.
Fr.: matrice nulle
Same as → null matrix.
Fr.: méthode de zéro
same as → null method.
Fr.: point zéro
1) General: A starting point for making a measurement.
zero point energy
kâruž-e noqte-ye sefr
Fr.: énergie du point zéro, point zéro
The lowest possible energy that a → quantum mechanical system may possess. It is the energy of the → ground state of the system. The term "zero point" refers to the observed fact that → vacuum fluctuations persist at → absolute zero temperature. Same as → vacuum energy.
Fr.: polynôme nul
A → polynomial whose → coefficients are all zero. See also → non-zero polynomial.
→ zero; → polynomial.
Fr.: suppression de zéro
The removal of non-significant zeroes from a number. For example, replacing 531.2300 by 531.23.
→ zero; → suppression.
ruye-ye tondâ-ye sefr
Fr.: surface de vitesse nulle
In the → restricted three-body problem, a surface which limits the region of space in which a small body can move. In the expression for the → Jacobi integral, the left side value is always positive or nul; hence the particle motion is confined to the region where U ≤ CJ. The surface that limits this region, defined by U = CJ, is called the zero-velocity surface.
zeroth law of thermodynamics
qânun-e sefrom-e garmâtavânik
Fr.: loi zéro de la thermodynamique
Two objects that are in → thermal equilibrium with a third object will be in thermal equilibrium with each other.
→ zero; → law; → thermodynamics.