A zeptojoule (zJ) is an SI unit of energy representing 10^-21 joules. It operates at the scale of thermal fluctuations at room temperature, making it a critical unit in thermodynamics, statistical mechanics, and nanotechnology. The energy required to flip a single bit in theoretical computing limits is measured in zeptojoules.
Heard on the job
The thermal noise floor of the sensor is around four zeptojoules at room temperature.