Convert Microjoules to Joules
Convert Microjoules (µJ) to Joules (J) instantly and accurately.
Conversion Formula
J = µJ × 1.000000000e-6
About Microjoules
A microjoule (µJ) is 10⁻⁶ J - the scale of precision laser ablation, ESD damage events, and individual LIDAR pulses. LASIK eye surgery delivers 0.5-2 µJ per pulse at 193 nm, ablating ~0.25 µm of corneal tissue per pulse. ESD events that destroy IC gates correspond to 1-1,000 µJ; the Human Body Model test discharges ~500 µJ at 2 kV. Q-switched microchip laser pulses for rangefinding are 1-100 µJ. The kinetic energy of a 1 mg grain of sand falling 10 cm is mgh ≈ 0.98 µJ. 1 µJ = 10⁻⁶ J.
About Joules
The joule (J) is the SI unit of energy, defined as one newton acting through one metre (1 J = 1 N·m = 1 kg·m²/s²). Named after James Prescott Joule, whose 1840s paddle-wheel experiments established the mechanical equivalent of heat (~4.15 J = 1 calorie). One joule is modest: it lifts a 100 g apple by 1 m, heats 0.239 mL of water by 1°C, or powers a 1 W LED for 1 second. Daily adult resting metabolism is ~6-9 MJ. 1 J = 1 W·s = 0.23901 cal = 9.4782 × 10⁻⁴ BTU = 2.7778 × 10⁻⁷ kWh.
Quick Reference Table
| Microjoules (µJ) | Joules (J) |
|---|---|
| 1 µJ | 1 × 10-6 J |
| 2 µJ | 2 × 10-6 J |
| 5 µJ | 5 × 10-6 J |
| 10 µJ | 1 × 10-5 J |
| 25 µJ | 2.5 × 10-5 J |
| 50 µJ | 5 × 10-5 J |
| 100 µJ | 1 × 10-4 J |