Roxul Industrial Insulation Process - Manual (Page 136)

Unit
s, c
onv
er
sion f
act
or
s and t
abl
es
3.1.2 Mathematical symbols
Symbol Definition Unit
α Linear expansion coefficient K -1
Λ Thermal conductance W/(m 2 ⋅ K)
λ Thermal conductivity W/(m ⋅ K)
ε Emissivity -
η Yield, efficiency -
ϑ (also t) Temperature °C
μ Water vapor resistance factor -
μ Water vapor resistance -
ρ Density kg/m 3
ϕ Relative humidity -
Ξ Air flow resistance Pa ⋅ s/m 2
Mathematical symbols
= equal to
< less than
≤ less than or equal to
<< much less than
+ plus
∞ infinity
π pi ≈ 3.14159
≈ approximately
> greater than
≥ equal to or greater than
>> much greater than
Δ Difference
Σ Sum
ln Logarithm base e
log Logarithm base 10
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