Pascal (unitatea)

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

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

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

Honako baliokidetzak ditu bestelako presio-unitateekin:

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

Multiploak

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