Convert Week (week) to Femtosecond (fs) instantly.
About these units
Week (week)
A week consists of seven days, a structure stemming from ancient Babylonian and Near Eastern traditions that associated each day with a celestial body (Sun, Moon, and five visible planets). The seven-day week spread through Judaism, Christianity, and Islam, becoming one of the world's most persistent cultural time cycles. Unlike the day, month, or year, the week has no astronomical basis—its endurance is purely cultural. Yet it organizes labor systems, religious observances, markets, and global business schedules. The survival of the week across millennia demonstrates the remarkable staying power of cultural tradition, transcending scientific revolutions, political changes, and the rise of international standardization.
Femtosecond (fs)
A femtosecond equals 10⁻¹⁵ seconds, a staggering scale where fundamental molecular motions occur. Chemical bonds vibrate, break, and rearrange on femtosecond timescales. Ultrafast spectroscopy—pioneered by Ahmed Zewail, who won the Nobel Prize for this work—uses femtosecond laser pulses to "freeze" molecular reactions and observe them in real time. Femtosecond lasers allow extraordinary precision in surgery and microfabrication, producing minimal heat diffusion and ultraclean cuts. At this scale, time ceases to be a continuous blur and becomes granular in terms of molecular motion, giving rise to the field of femtochemistry and revolutionizing our understanding of reaction dynamics.