What is w in?

W in (Watt-inch)

The watt-inch (W in) is a unit of thermal conductivity. It measures the amount of power (in watts) that can be transferred through a material that is one inch thick, per degree Fahrenheit of temperature difference per square inch of area. It is an Imperial unit.

• It is related to other units of thermal conductivity.
• Conversion is possible to W/mK (Watt per meter-Kelvin), the SI unit for thermal conductivity. To convert from W in to W/mK, you multiply by 173.0735.
• Used in some engineering fields, particularly in the United States.