Pascal (unitatea)

Pascala (sinboloa: Pa^[1]) Nazioarteko Unitate Sistemako presio-unitatea da. Definizioz ${\displaystyle {\text{ 1 N}}}$-eko indar batek berarekiko normala den ${\displaystyle {\text{1 m}}^{2}}$-ko azalera duen gainazalean eragiten duen presioa da. Unitatearen izena Blaise Pascal (1623-1662) matematikari eta fisikari frantziarraren ohorez aukeratu zen^[2].

$${\displaystyle {\text{Pa}}={\frac {\text{N}}{{\text{m}}^{2}}}={\frac {\text{J}}{{\text{m}}^{3}}}={\frac {\text{kg}}{{\text{m}}\cdot {{\text{s}}^{2}}}},}$$

non ${\displaystyle {\text{N}}}$ (newton), ${\displaystyle {\text{m}}}$ (metro), ${\displaystyle {\text{J}}}$ (joule), ${\displaystyle {\text{kg}}}$ (kilogramo), ${\displaystyle {\text{s}}}$ segundo unitateak diren.

Honako baliokidetzak ditu bestelako presio-unitateekin:

$${\displaystyle {\text{1 Pa}}=10^{-5}{\text{ bar}}={\text{10 baria}}=9,86923\times 10^{-6}{\text{atm}}.}$$

Multiploa	Izena	Sinboloa		Multiploa	Izena	Sinboloa
${\displaystyle 10^{0}=1}$	pascal	${\displaystyle {\text{Pa}}}$
${\displaystyle 10^{1}}$	dekapascal	${\displaystyle {\text{daPa}}}$		${\displaystyle 10^{-1}}$	dezipascal	${\displaystyle {\text{dPa}}}$
${\displaystyle 10^{2}}$	hektopascal	${\displaystyle {\text{hPa}}}$		${\displaystyle 10^{-2}}$	zentipascal	${\displaystyle {\text{cPa}}}$
${\displaystyle 10^{3}}$	kilopascal	${\displaystyle {\text{kPa}}}$		${\displaystyle 10^{-3}}$	milipascal	${\displaystyle {\text{mPa}}}$
${\displaystyle 10^{6}}$	megapascal	${\displaystyle {\text{MPa}}}$		${\displaystyle 10^{-6}}$	mikropascal	${\displaystyle \mu {\text{Pa}}}$
${\displaystyle 10^{9}}$	gigapascal	${\displaystyle {\text{GPa}}}$		${\displaystyle 10^{-9}}$	nanopascal	${\displaystyle {\text{nPa}}}$
${\displaystyle 10^{12}}$	terapascal	${\displaystyle {\text{TPa}}}$		${\displaystyle 10^{-12}}$	pikopascal	${\displaystyle {\text{pPa}}}$
${\displaystyle 10^{15}}$	petapascal	${\displaystyle {\text{PPa}}}$		${\displaystyle 10^{-15}}$	femtopascal	${\displaystyle {\text{fPa}}}$
${\displaystyle 10^{18}}$	exapascal	${\displaystyle {\text{EPa}}}$		${\displaystyle 10^{-18}}$	attopascal	${\displaystyle {\text{aPa}}}$
${\displaystyle 10^{21}}$	zettapascal	${\displaystyle {\text{ZPa}}}$		${\displaystyle 10^{-21}}$	zeptopascal	${\displaystyle {\text{zPa}}}$
${\displaystyle 10^{24}}$	yottapascal	${\displaystyle {\text{YPa}}}$		${\displaystyle 10^{-24}}$	yoktopascal	${\displaystyle {\text{yPa}}}$