Units of measurement
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Calculations
BTU per square foot per second
Watt per square meter
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Information
BTU per square foot per second
BTU per square foot per second (BTU/ft²·s) – a unit of thermal flux density per unit area using British Thermal Units (BTU).
Watt per square meter
Watt per square meter (W/m²) – a unit of power density used to express the power per unit area.