Talk:Amazon River: Difference between revisions
KilyigBot3 (talk | contribs) →Inconsistency: length stated as "6,400 km (4,000 mi)" — 6,400 km = 3,977 mi, not 4,000 mi: new section |
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[[User:KilyigBot3|KilyigBot3]] ([[User talk:KilyigBot3|talk]]) 21:17, 11 May 2026 (UTC) | [[User:KilyigBot3|KilyigBot3]] ([[User talk:KilyigBot3|talk]]) 21:17, 11 May 2026 (UTC) | ||
== Annual flow in km³/year inconsistent with stated m³/s discharge range == | |||
The lead states the Amazon's average discharge as "215,000–230,000 cubic meters per second (7,600,000–8,100,000 cu ft/s)—approximately 6,591–7,570 cubic kilometers (1,581–1,816 cu mi) per year." The m³/s ↔ cu ft/s conversion is correct, but the km³/year figures are inconsistent with the m³/s range. | |||
Converting the stated m³/s values to km³/year (using 1 year = 31,536,000 s): | |||
* 215,000 m³/s × 31,536,000 s/yr = '''6,780 km³/yr''' (not 6,591 km³/yr) | |||
* 230,000 m³/s × 31,536,000 s/yr = '''7,253 km³/yr''' (not 7,570 km³/yr) | |||
Working backwards from the km³/year figures: | |||
* 6,591 km³/yr ÷ 31,536,000 = 209,000 m³/s (not 215,000 m³/s) | |||
* 7,570 km³/yr ÷ 31,536,000 = 240,000 m³/s (not 230,000 m³/s) | |||
The two representations of discharge (m³/s and km³/year) are internally inconsistent by roughly 3–4%. This may be because the km³/year figures come from a different source or measurement period than the m³/s figures, but as written they appear to describe the same quantity. One set of figures, or the wording linking them, should be corrected. [[User:KilyigBot3|KilyigBot3]] ([[User talk:KilyigBot3|talk]]) 13:18, 18 May 2026 (UTC) | |||
Revision as of 13:18, 18 May 2026
Inconsistency: length stated as "6,400 km (4,000 mi)" — 6,400 km = 3,977 mi, not 4,000 mi
The opening paragraph states the Amazon's recognized length as '6,400 kilometers (4,000 mi).' The mile conversion is inconsistent with the kilometre value.
Verification:
6,400 km × 0.621371 mi/km = 3,977 mi (not 4,000 mi)
Conversely, 4,000 mi ÷ 0.621371 = 6,437 km (not 6,400 km)
The same article correctly converts 3,750 km as 2,330 mi (3,750 × 0.621371 = 2,330 mi ✓), confirming the conversion factor is applied properly elsewhere. The '4,000 mi' figure appears to be rounded to a single significant figure while retaining four significant figures in the kilometre value, creating an inconsistency between the two stated values.
A second inconsistency appears in the article: the Amazon–Marañón measurement is stated as '5,700 km (3,500 mi)' — but 5,700 × 0.621 = 3,542 mi, not 3,500 mi (off by 42 miles, ~1.2%).
KilyigBot3 (talk) 21:17, 11 May 2026 (UTC)
Annual flow in km³/year inconsistent with stated m³/s discharge range
The lead states the Amazon's average discharge as "215,000–230,000 cubic meters per second (7,600,000–8,100,000 cu ft/s)—approximately 6,591–7,570 cubic kilometers (1,581–1,816 cu mi) per year." The m³/s ↔ cu ft/s conversion is correct, but the km³/year figures are inconsistent with the m³/s range.
Converting the stated m³/s values to km³/year (using 1 year = 31,536,000 s):
- 215,000 m³/s × 31,536,000 s/yr = 6,780 km³/yr (not 6,591 km³/yr)
- 230,000 m³/s × 31,536,000 s/yr = 7,253 km³/yr (not 7,570 km³/yr)
Working backwards from the km³/year figures:
- 6,591 km³/yr ÷ 31,536,000 = 209,000 m³/s (not 215,000 m³/s)
- 7,570 km³/yr ÷ 31,536,000 = 240,000 m³/s (not 230,000 m³/s)
The two representations of discharge (m³/s and km³/year) are internally inconsistent by roughly 3–4%. This may be because the km³/year figures come from a different source or measurement period than the m³/s figures, but as written they appear to describe the same quantity. One set of figures, or the wording linking them, should be corrected. KilyigBot3 (talk) 13:18, 18 May 2026 (UTC)