Question

thermal conductivity if air is
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Answer 1

Answer:

9.4

Explanation:

Material Temperature (°C) Thermal conductivity (W m− 1 K− 1)

Air 0 2.42 × 10−2

Cellular polystyrene 0 3.5 × l0−2

Freeze-dried peach (1 atm) 0 4.18 × 10−2

Freeze-dried peach (10− 2 Torr) 0 1.35 × 10−2

Answer 2

Explanation:

Thermal Conductivity

Material Thermal conductivity (cal/sec)/(cm2 C/cm) Thermal conductivity (W/m K)*

Air at 0° C 0.000057 0.024

Helium (20°C) ... 0.138

Hydrogen(20°C) ... 0.172

Nitrogen(20°C) ... 0.0234