The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005ρ + 0.15/ρ where λ is the thermal conductivity of the fabric in W/(m⋅K), ρ is the bulk density of the fabric in kg/m3, and ρ∈[10,200]. Thermal conductivity is minimum when the bulk density is approximately

The thermal conductivity of a nonwoven fabric is given by λ = 0.

1.	The thermal conductivity of a nonwoven fabric is given by  λ = 0.03 + 0.00005ρ + 0.15/ρ  where λ is the thermal conductivity of the fabric in W/(m⋅K), ρ is the bulk density of the fabric in kg/m3, and ρ∈[10,200]. Thermal conductivity is minimum when the bulk density is approximately
A.	10
B.	20
C.	55
D.	200
Answer» D. 200

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