Convert Joule per Square Meter to Langley
Live bidirectional calculator for Joules per Square Meter (J/m²) and Langleys (Ly) with verified formula and conversion charts.
Heat Density5 units
How the Calculation Works (Linear Scaling)
Since 1 Langley = 41840 Joules per Square Meter, divide the value in Joules per Square Meter by 41840.
Joule per Square Meter to Langley Conversion Table
Precomputed values for quick reference and printing.
| Joule per Square Meter | Langley |
|---|---|
| 1 J/m² | 2.3901e-5 Ly |
| 2 J/m² | 4.7801e-5 Ly |
| 3 J/m² | 7.1702e-5 Ly |
| 4 J/m² | 9.5602e-5 Ly |
| 5 J/m² | 0.0001 Ly |
| 6 J/m² | 0.0001 Ly |
| 7 J/m² | 0.0002 Ly |
| 8 J/m² | 0.0002 Ly |
| 9 J/m² | 0.0002 Ly |
| 10 J/m² | 0.0002 Ly |
| 15 J/m² | 0.0004 Ly |
| 20 J/m² | 0.0005 Ly |
| 25 J/m² | 0.0006 Ly |
| 30 J/m² | 0.0007 Ly |
| 40 J/m² | 0.001 Ly |
| 50 J/m² | 0.0012 Ly |
| 75 J/m² | 0.0018 Ly |
| 100 J/m² | 0.0024 Ly |
| Langley | Joule per Square Meter |
|---|---|
| 1 Ly | 41840 J/m² |
| 2 Ly | 83680 J/m² |
| 3 Ly | 125520 J/m² |
| 4 Ly | 167360 J/m² |
| 5 Ly | 209200 J/m² |
| 6 Ly | 251040 J/m² |
| 7 Ly | 292880 J/m² |
| 8 Ly | 334720 J/m² |
| 9 Ly | 376560 J/m² |
| 10 Ly | 418400 J/m² |
| 15 Ly | 627600 J/m² |
| 20 Ly | 836800 J/m² |
| 25 Ly | 1046000 J/m² |
| 30 Ly | 1255200 J/m² |
| 40 Ly | 1673600 J/m² |
| 50 Ly | 2092000 J/m² |
| 75 Ly | 3138000 J/m² |
| 100 Ly | 4184000 J/m² |
📌 Standard Benchmark Reference Values
Exact solar radiation energy density standard (1 cal_th/cm² = 41,840 J/m²).
Exact RatioAbout Joule per Square Meter (J/m²)
The SI unit of surface heat density or radiant exposure, representing 1 joule of thermal or radiant energy accumulated per square meter of surface area.
History: Codified in radiometry and heat transfer as radiant exposure (H) and area energy density.
Common Uses: Solar insolation daily totals, laser pulse fluence, thermal radiation surface absorption.
About Langley (Ly)
A unit of solar radiation energy density equal to 1 thermochemical calorie per square centimeter (exactly 41,840 J/m²).
History: Named in 1947 after American astrophysicist and aviation pioneer Samuel Pierpont Langley (1834–1906).
Common Uses: Meteorology, solar radiation climatology, agronomy and evapotranspiration modeling.
❓ Frequently Asked Questions
How many Langleys are in 1 Joule per Square Meter?
There are exactly 0.000024 Langleys in 1 Joule per Square Meter (1 J/m² = 0.000024 Ly).
What is the formula to convert Joule per Square Meter to Langley?
The formula is: Langley = Joule per Square Meter / 41840. Since 1 Langley = 41840 Joules per Square Meter, divide the value in Joules per Square Meter by 41840.
How do I convert 1 J/m² to Ly manually?
To convert 1 J/m² to Ly: apply the formula Langley = Joule per Square Meter / 41840. Substituting gives: 1 / 41840 = 2.3901e-5 Ly.