PHYSICAL QUANTITY

Pressure: formulas and units of measurement

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

pp\text{Па}pascal

KEY CONNECTIONS

Formulas

p=\frac{F}{S}p = F / S

p=\rho ghp = ρgh

p=\frac{1}{3}m_0n\left\langle v^2\right\ranglep = (1/3)m₀n⟨v²⟩

p=\frac{2}{3}n\left\langle E\right\ranglep = (2/3)n⟨E⟩

p=nkTp = nkT

pV=\frac{m}{M}RTpV = (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: Velocity is the rate and direction of change of a body's 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

PRACTICE