The millisecond equals 0.001 second. Essential in computing, networking and high-speed photography. Human reaction time is about 200–300 ms. Video frame rates of 60 fps correspond to a 16.67 ms per frame.
Real-world: Ping to a local server: 5–20 ms. Game frame at 60 fps: 16.67 ms. Human reaction: 200–300 ms.
Read full millisecond reference →The second is the SI base unit of time. It is defined by the caesium-133 atomic transition: 9,192,631,770 cycles of this oscillation equal one second. Modern atomic clocks maintain the second to about 10⁻¹⁶ accuracy — you would lose one second in 100 million years.
Real-world: A blink takes 100–400 ms. Heartbeat at rest ~1 s. The 100 m sprint world record is 9.58 s (Usain Bolt).
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