the.com/insulation
the quiet hero that does nothing but holds the entire world's warmth hostage
means a material or layer that blocks the passage of heat, cold, sound, or electricity, keeping what's inside in and what's outside out
from From Latin 'insula,' meaning island — the same root behind 'isolate' and even 'peninsula' ('almost an island'). To insulate is, at heart, to make something into an island: cut off, surrounded, untouched by what's around it. The word entered English in the 1700s for electrical and thermal separation, carrying that quiet image of a thing set apart by a moat of empty space.
- trapped air
- It mostly works by holding still air in place
- asbestos past
- Once prized as fireproof insulation, later banned as deadly
- space tech
- Aerogel insulates spacecraft and barely weighs anything
- animal origins
- Fur and feathers are nature's original insulation
- R-value
- Its power is measured in resistance to heat flow
fiberglass insulation — most common type in us homes, r-value 3.2-3.8 per inch, invented 1938
spray foam insulation — closed-cell polyurethane, r-value 6-7 per inch, used in modern retrofits
rockwool insulation — mineral wool made from basalt rock, r-value 3.3 per inch, fire-resistant