Heat Density Converter
Convert heat density (also called heat flux density per area) between joules per square metre, BTU per square foot and related units.
Written by Rahman · Last reviewed
Quick answer
Heat density is energy per unit area, in joules per square metre. One calorie per square centimetre (also called the langley, used in solar radiation measurement) is 41,868 J/m², and one BTU per square foot is 11,356.5. It describes energy delivered to a surface rather than energy contained in a volume.
| Joule per square metre (J/m²) | 1 |
| Calorie (IT) per square centimetre (cal/cm²) | 0.00002388458966 |
| Langley (Ly) | 0.00002388458966 |
| BTU (IT) per square foot (BTU/ft²) | 0.00008805509184 |
About the Heat Density Converter
Heat density measures the amount of heat energy per unit of area. The SI unit is the joule per square metre.
It is used in solar energy and thermal engineering, where the langley is also a common unit.
Frequently Asked Questions
What is heat density?
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Heat density is the quantity of heat energy spread over a unit of surface area.
What is a langley?
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A langley is a unit of heat density equal to one calorie per square centimetre, often used in solar radiation measurements.
Where is heat density used?
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It is used in solar energy studies, climatology and thermal analysis of surfaces.