Why Water Temperature Matters
Too hot and coffee tastes harsh. Too cool and it's sour and flat. Here's the sweet spot — and why it changes with roast level.
🔬 The Science of Coffee
Why does water temperature change flavour? What actually happens during extraction? We explain the science without making it feel like homework.
Core Concepts
Extraction & Flavour
Understanding what's actually happening in your cup
Why Your Coffee Tastes Sour
Sourness in coffee is almost always under-extraction. Here's what that means, why it happens, and three fixes you can try right now.
Extraction Explained: What's Actually in Your Cup
Coffee is 98% water and 2% dissolved compounds. Understanding which compounds extract when — and in what order — changes everything.
Water & Grind
Two Variables That Control Everything
Your water and your grind size do more than any expensive equipment
Water Quality & Coffee
Hard water, soft water, filtered water — they all taste different in coffee. Here's what matters and what you can do with regular tap water.
Grind Size: The Variable You're Probably Ignoring
Grind size controls surface area and contact time. A simple guide to what coarse, medium, and fine actually means for your cup.
Bloom & Degassing: Why Fresh Coffee Bubbles
The bloom step isn't ritual — it's chemistry. Freshly roasted beans release CO₂ that interferes with extraction. Here's why it matters.
☕ Common Coffee Myths — Busted
❌ Myth
You should use boiling water for coffee
✅ Reality
Boiling water (100°C) over-extracts and scorches. Aim for 90–96°C depending on roast.
❌ Myth
Dark roast has more caffeine than light roast
✅ Reality
Light roast has slightly more caffeine. Roasting breaks down caffeine, so lighter = more.
❌ Myth
Store coffee in the freezer to keep it fresh
✅ Reality
Freeze-thaw cycles degrade coffee. An airtight container at room temperature is better for daily use.
❌ Myth
Expensive grinder = better coffee
✅ Reality
Grind consistency matters more than price. A decent $50 burr grinder beats a $200 blade grinder for coffee quality.