RSI stands for resistance to heat flow. Which of the following describes its unit?

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Multiple Choice

RSI stands for resistance to heat flow. Which of the following describes its unit?

Explanation:
RSI represents how much a material resists heat flow for a given area and temperature difference. In SI terms, it is the amount of area times temperature difference per unit of heat flow, so its unit is m^2·K/W. Since a temperature difference can be expressed in either Kelvin or Celsius with the same size, you can also write it as m^2·°C/W. The other units shown correspond to thermal conductivity (W/m·K), imperial resistance (Btu·ft^2·h/ft^2·°F), or density (kg/m^3), none of which describe RSI.

RSI represents how much a material resists heat flow for a given area and temperature difference. In SI terms, it is the amount of area times temperature difference per unit of heat flow, so its unit is m^2·K/W. Since a temperature difference can be expressed in either Kelvin or Celsius with the same size, you can also write it as m^2·°C/W. The other units shown correspond to thermal conductivity (W/m·K), imperial resistance (Btu·ft^2·h/ft^2·°F), or density (kg/m^3), none of which describe RSI.

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