Total rise = 2.5 mm/year × 10 years/decade × 4 decades = **100 mm

Mon, 04 May 2026 09:03:19 +0000

Total Rise Over Four Decades: Understanding the Cumulative Impact of 2.5 mm/Year Over time, even small, consistent changes can accumulate into significant transformation—this principle perfectly applies to material expansion, climate measurements, and engineering planning. Consider a scenario where the annual rise is 2.5 millimeters per year. At first glance, this may seem minimal, but when measured over decades, the cumulative effect becomes impressive. ### The Step-by-Step Calculation:
- Annual rise: 2.5 mm
- Timescales:
- Per decade: 10 years
- Over four decades: 10 years/decade × 4 decades = 40 years
- Total rise: 2.5 mm/year × 40 years = 100 mm ### Why 100 mm Matters
That’s exactly 10 centimeters—a measurable shift visible in multiple contexts: