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Every concept is a two-dimensional card. One axis defines it (what it is, what it is not, its essence, necessary conditions, common misconceptions); the other axis guides practice (how to deal with it, what to do, what to avoid, examples). Concepts form a tree, from broad ideas down to specific subtopics.

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Knowledge card

Density ρ

Mathematical Modelling — Fluid Dynamics & Heat TransferContinuum mechanics; boundary-layer similarity theory

Symbol

ρ

Mass per unit volume (kg/m³); ρ_f for the base fluid, ρ_hnf for the mixture.

Also known as:ρ

Variable

Dimension I

Definition

What it is — and what it is not

What it is: S1Density (kg/m³): ρ_f base, ρ_hnf the mixture value.

Dimension II

In practice

How to deal with it

No practical guidance recorded yet.

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