The SI unit of thermal conductivity is:
(a) W m⁻¹ K⁻¹
(b) cal m⁻¹ °C⁻¹
(c) W m K⁻¹
(d) W m² K⁻¹
WBBSE
Class X
Physical Science
Thermal phenomena
01 Mark
2026
(a) W m⁻¹ K⁻¹
Explanation
The SI unit of thermal conductivity is watt per metre per kelvin (W m⁻¹ K⁻¹).
Thermal conductivity is defined as the amount of heat conducted per second through unit area of a material of unit thickness when the temperature difference between its two faces is 1 K.
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