Convert Picojoules to Joules
Convert Picojoules (pJ) to Joules (J) instantly and accurately.
Conversion Formula
J = pJ × 1.000000000e-12
About Picojoules
A picojoule (pJ) is 10⁻¹² J - the scale of laser pulses in scientific instruments and chip-level capacitor storage. A 1 pF capacitor charged to 1 V stores exactly 0.5 pJ. Laser pulse energies in OCT and ultrafast spectroscopy are typically 1-1,000 pJ. Single-photon SNSPD detector dead-time dissipates 1-100 pJ per event. Phase-change memory cells (PCM, ReRAM) switch at 10-100 pJ per state transition, setting a lower bound on non-volatile memory energy efficiency. 1 pJ = 10⁻¹² J = 6.242 MeV.
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
| Picojoules (pJ) | Joules (J) |
|---|---|
| 1 pJ | 1 × 10-12 J |
| 2 pJ | 2 × 10-12 J |
| 5 pJ | 5 × 10-12 J |
| 10 pJ | 1 × 10-11 J |
| 25 pJ | 2.5 × 10-11 J |
| 50 pJ | 5 × 10-11 J |
| 100 pJ | 1 × 10-10 J |