Pressure
Pressure is the force applied per unit area.
Mathematically, it is expressed as:
$$
P = \frac{F}{A}
$$
where:
A cylinder with a weight of 500 N and a base area of 0.2 m² exerts a pressure of:
$$
P = \frac{500 \, \text{N}}{0.2 \, \text{m}^2} = 2500 \, \text{Pa}
$$
Always ensure the force is perpendicular to the surface when calculating pressure.
The amount of substance is measured in moles, a fundamental concept in chemistry and physics.
Mole
A mole is defined as the amount of substance containing as many particles (atoms, molecules, etc.) as there are atoms in 12 grams of carbon-12.
This number is the Avogadro constant,$N_A$, approximately $6.022 \times 10^{23}$ particles per mole.
If a substance contains $N$ particles, the number of moles $n$ is given by:
$$
n = \frac{N}{N_A}
$$
where:
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