Scientific Ontology

p

Mechanics

Pressure

Force applied per unit area.

pascal (Pa)

Dimension: $[\,M L^{-1} T^{-2}\,]$

How values of pressure span the physical world (in Pa, log scale).

Best lab vacuum

10^-10 Pa

Atmosphere (sea level)

10⁵ Pa

Ocean's deepest point

1.10 × 10⁸ Pa

Centre of the Sun

2.50 × 10¹⁶ Pa

Lower limit10^-10 PaUpper limit10³⁴ Pa

Pressure

p = \dfrac{F}{A}

Ideal Gas Law

p V = n R T

Ideal Gas Law (Boltzmann form)

pV = Nk_BT