Axis

Thermal resistance

R-valueR

The US insulation R-value: ft²·°F·h per BTU.

Dimension
T³·Θ/M
Canonical signature
M^-1*T^3*Θ
System
imperial us
Exactness
Exact by definition

Definition record

How this unit is defined

Canonical base
1 R = 1 R
Conversion type
linear
Historical notes
Converted to SI RSI (K·m²/W) by multiplying by 0.176110.
Aliases
R value, hr·ft²·°F/BTU, US R-value

Same dimension

Related units

RSI (K·m²/W)siK·m²/W

Common conversions

Every conversion routes through the canonical base of the dimension.

1 R = 1 R

Exact by definition relationship

10 R = 10 R

Exact by definition relationship