1. K cal/kg m² °C
  2. K cal m/hr m² °C
  3. K cal/hr m² °C
  4. K calm/hr °C
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Answer: Option 2

Thermal Conductivity is the quantity of heat that passes in unit time through unit area of a substance whose thickness is unity, when its opposite faces differ in temperature by one degree.Unit of thermal conductivity in M.K.S. units is K cal m/hr m² °C

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