Definition:Positive Unit Normal/Unclosed Surface
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Definition
Let $S$ be a surface in ordinary $3$-space.
A positive unit normal to $S$ is a unit normal $\mathbf {\hat n}$ to $S$ whose direction is arbitrarily defined, but usually such that it is generally away from the origin of whatever coordinate system is being used.
Also see
Sources
- 1951: B. Hague: An Introduction to Vector Analysis (5th ed.) ... (previous) ... (next): Chapter $\text {II}$: The Products of Vectors: $3$. Line and Surface Integrals: Footnote $(*)$