PHYSICAL QUANTITY

Pressure: formulas and units of measurement

Pressure: symbol p, unit Pa. Formulas and explanations for Mechanics, MCT and thermodynamics.

p

\text{Pa}

pascal

KEY CONNECTIONS

Formulas

p = \frac{F}{S}

p = F / S

p = ρ g h

p = ρgh

p = \frac{1}{3} m_{0} n ⟨ v^{2} ⟩

p = (1/3)m₀n⟨v²⟩

p = \frac{2}{3} n ⟨ E ⟩

p = (2/3)n⟨E⟩

p = n k T

p = nkT

p V = \frac{m}{M} R T

pV = (m/M)RT

NOTATION

$p$: Pressure is the force per unit surface area.
$F$: Force is a measure of the interaction of bodies that changes their movement or shape.
$S$: Area is the size of a surface or cross section.
$\rho$: Density is the mass of a substance per unit volume.
$g$: Gravity acceleration is the acceleration of a body under the influence of gravity without taking into account the resistance of the medium.
$h$: Height - vertical distance from the selected level.
$m_0$: The mass of one particle is the mass of an individual molecule or atom of a substance.
$n$: Concentration is the number of particles per unit volume.
$v$: Speed is the speed and direction of change in body position.
$E$: The average kinetic energy of a particle is the average energy of thermal motion of one particle.
$k$: Boltzmann's constant is the coefficient of correlation between temperature and particle energy.
$T$: Temperature is a measure of the thermal state of the body.
$V$: Volume is the size of the area of space occupied by a body.
$m$: Mass is a scalar physical quantity that is a measure of the inertia of a body.
$M$: Molar mass is the mass of one mole of a substance.
$R$: The universal gas constant is the coefficient of connection between the parameters of an ideal gas.

THEORY