Clarifying that altitude affects water's boiling point, not its suitability for skincare cleansing

Why altitude's genuine effect on water's boiling point doesn't extend to affecting cleansing-temperature water in any meaningful way

Altitude genuinely lowers water's boiling point due to reduced atmospheric pressure — a real, well-documented physical effect relevant to cooking — but this specific effect has no meaningful relevance to lukewarm or cold water used for skincare cleansing, since cleansing water temperature is far below boiling point regardless of altitude.

Why this distinction matters specifically because the genuine boiling-point fact sometimes gets loosely over-generalised into unrelated claims

The genuine, well-established altitude-boiling-point relationship sometimes gets loosely extended into unrelated claims about altitude affecting other water properties relevant to skincare, when the actual physics of the boiling-point effect simply doesn't apply to lukewarm cleansing water temperatures — a useful distinction to clarify rather than accepting an over-generalised claim.

Recognising which altitude-water claims are genuinely relevant (UV intensity, as previously discussed) versus which aren't (cleansing water temperature effects)

While altitude does genuinely affect UV intensity in ways relevant to sun protection, it doesn't meaningfully affect cleansing water's suitability or temperature-related cleansing performance — useful to distinguish which altitude-related skincare claims have genuine physical basis from which don't.

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