Convert Second-degree Fahrenheit per BTU to Degree Celsius per milliwatt
Convert Second-degree Fahrenheit per BTU (s·°F/BTU) to Degree Celsius per milliwatt (°C/mW) instantly and accurately.
Conversion Formula
°C/mW = s·°F/BTU × 5.265650668e-7
About Second-degree Fahrenheit per BTU
The second-degree Fahrenheit per BTU (s·°F/BTU) equals (5/9)/1055.05585262 K/W ≈ 5.265 × 10⁻⁴ K/W. Used in US aerospace and nuclear engineering where thermal transient analyses express power as BTU/s and temperature in °F, e.g. rocket engine heat rejection and reactor coolant loop calculations. 1 s·°F/BTU ≈ 5.265 × 10⁻⁴ K/W.
About Degree Celsius per milliwatt
The degree Celsius per milliwatt (°C/mW) equals exactly 1000 K/W since 1 mW = 10⁻³ W and 1 °C = 1 K. Widely used in low-power semiconductor datasheets for characterising junction-to-ambient resistance: small-signal transistors, LEDs, photodiodes, and SMD resistors typically show RθJA of 50-500 °C/mW. A device at 200 °C/mW dissipating 5 mW rises 1 °C. 1 °C/mW = 1000 K/W = 1 kK/W.
Quick Reference Table
| Second-degree Fahrenheit per BTU (s·°F/BTU) | Degree Celsius per milliwatt (°C/mW) |
|---|---|
| 1 s·°F/BTU | 5.266 × 10-7 °C/mW |
| 2 s·°F/BTU | 1.053 × 10-6 °C/mW |
| 5 s·°F/BTU | 2.633 × 10-6 °C/mW |
| 10 s·°F/BTU | 5.266 × 10-6 °C/mW |
| 25 s·°F/BTU | 1.316 × 10-5 °C/mW |
| 50 s·°F/BTU | 2.633 × 10-5 °C/mW |
| 100 s·°F/BTU | 5.266 × 10-5 °C/mW |