Encyclopedia > R-value

Article Content

R-value

The R-value is a measure of thermal resistance used in housing insulation. It is defined as R = ft² F° h / Btu.

For comparison, the SI unit of thermal resistance is R = K.m²/W, and 1 ft² F° h / Btu = approx. 0.1761 K.m²/W.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Bugatti

... of each of Ettore Bugatti's vehicles were ever produced, the most famous being the Type 35 Grand Prix car, the huge "Royale[?]", and the Type 55 sports car. Bugatti ...