Millisecond to Second
ms
s
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
1 ms (Millisecond) → 0.001 s (Second) Just now |
Quick Reference Table (Millisecond to Second)
| Millisecond (ms) | Second (s) |
|---|---|
| 1 | 0.001 |
| 16 | 0.016 |
| 20 | 0.02 |
| 100 | 0.1 |
| 300 | 0.3 |
| 400 | 0.4 |
| 1,000 | 1 |
About Millisecond (ms)
A millisecond (ms) is one thousandth of a second (10⁻³ s), the boundary between what electronics perceive and what humans begin to notice. Human reaction time to a visual stimulus is 150–300 ms. A camera shutter at 1/1,000 s exposes for 1 ms. Internet ping times under 20 ms feel instantaneous in gaming; over 100 ms begins to feel laggy. A blink of an eye takes 100–400 ms. Audio artifacts shorter than about 20 ms are inaudible; longer delays cause perceptible echo. Heartbeat intervals in medical ECG are measured in milliseconds.
Human blink takes 100–400 ms. A ping under 20 ms feels instant in online games. A camera at 1/1000 s exposes for 1 ms.
About Second (s)
The second (s) is the SI base unit of time, defined as exactly 9,192,631,770 periods of the radiation of the caesium-133 atom in its ground state hyperfine transition. Before 1967 it was defined as 1/86,400 of a mean solar day, but atomic clocks now provide a definition independent of Earth's rotation. The second is the foundation of all time measurement — minutes, hours, and days are multiples of seconds. In physics and engineering, time is always converted to seconds for calculations. The second is also the unit in which speed of light and gravitational constants are expressed.
A human heartbeat at rest is about 1 second. Light travels 299,792 km in 1 second. The 100 m sprint world record is under 10 seconds.
Etymology: From Latin 'secunda minuta' (second small part), contrasted with 'prima minuta' (first small part, i.e. the minute). The hour was divided into 60 minutes and the minute into 60 seconds — both steps inheriting the sexagesimal (base-60) system of ancient Babylonian astronomy.
Millisecond – Frequently Asked Questions
What ping (latency) is acceptable for online gaming?
Under 20 ms feels virtually instant; 20–50 ms is excellent for most games; 50–100 ms is fine for casual play; 100–150 ms causes noticeable delay in fast-paced shooters; above 150 ms is problematic. Fighting games are the most latency-sensitive — competitive Street Fighter players complain about 8 ms differences. Fiber internet typically delivers 5–15 ms within a country; satellite internet (except Starlink) delivers 600+ ms, making real-time gaming impractical.
How long does a human blink take in milliseconds?
A single spontaneous blink takes 100–150 ms for the lid to close and open. Voluntary blinks are slightly slower at 200–400 ms. Humans blink 15–20 times per minute, spending about 10% of waking hours with eyes closed — without noticing, because the brain suppresses visual processing during blinks (saccadic suppression). The brain also smoothly fills in the missing visual gap, which is why blinking does not feel like a strobe effect.
Why does audio below 20 ms not sound like an echo?
The Haas Effect (or precedence effect) means the brain fuses sounds arriving within 30–40 ms of each other into a single perceived sound — the first arrival dominates direction and character. Echoes only become perceptible above ~50 ms. Recording studios use this: adding a delayed copy at 15–20 ms creates a chorus/widening effect without audible echo. Room reflections below 20 ms contribute to the 'liveness' of a space without sounding reverberant.
What does an ECG measure in milliseconds?
An ECG (electrocardiogram) records the heart's electrical cycle in ms. A normal PR interval (atrium to ventricle conduction) is 120–200 ms; QRS complex (ventricular depolarisation) is 80–100 ms; QT interval (ventricular depolarisation + repolarisation) is 350–440 ms. Prolonged QT (>500 ms) indicates arrhythmia risk. Cardiologists rely on ms-precision measurement to diagnose conduction disorders, heart blocks, and pre-excitation syndromes.
How fast is a hummingbird's wingbeat in milliseconds?
A ruby-throated hummingbird beats its wings 50–80 times per second, meaning each complete up-down stroke takes 12–20 ms. During courtship dives, the frequency can reach 200 beats/s (5 ms/beat). By comparison, a honeybee beats at 200 Hz (5 ms), a dragonfly at 30 Hz (33 ms), and a large butterfly at 5–12 Hz (83–200 ms). Smaller flying insects generally have higher wing frequencies because smaller wings generate less lift per stroke.
Second – Frequently Asked Questions
Why is there a leap second and who decides when to add one?
Earth's rotation is gradually slowing due to tidal friction from the Moon, running slightly slower than the atomic clock definition of the second. To keep UTC (atomic time) within 0.9 seconds of UT1 (astronomical time), leap seconds are periodically inserted — 27 have been added since 1972. The International Earth Rotation and Reference Systems Service (IERS) announces each leap second about 6 months in advance. In 2022, the ITU voted to eliminate leap seconds by 2035, allowing UTC to drift freely.
How many seconds are in a year?
A common year (365 days) contains exactly 31,536,000 seconds. A leap year has 31,622,400 seconds. The mean Gregorian year (365.2425 days) contains 31,556,952 seconds. The tropical year (365.24219 days) — the actual solar cycle — is 31,556,926 seconds. The difference between common year and tropical year (about 926 seconds ≈ 15 minutes) is why a simple 365-day calendar drifts against the seasons without leap year corrections.
Why did the second replace the solar day as the base time unit?
The solar day varies slightly (up to 30 seconds) due to Earth's elliptical orbit and axial tilt — making it unsuitable for precision timekeeping. Atomic clocks, defined by caesium-133 oscillations, are stable to 1 part in 10¹⁶ — drifting less than 1 second in 300 million years. GPS, financial transactions, mobile networks, and the internet all require sub-microsecond synchronisation that only atomic-clock-based seconds can provide.
What is the fastest human 100 m sprint time and why does tenths of a second matter?
Usain Bolt's 9.58 s world record from 2009 is 0.12 s faster than the previous record. At that speed (10.44 m/s average), 0.12 s corresponds to 1.25 m — nearly the length of a stride. Athletics timing uses 0.001 s (1 ms) precision; photo finish cameras operate at 1,000+ frames/second. Olympic medals have been separated by 0.001 s. The reaction time rule (any start under 0.1 s is a false start) is based on the minimum human neural response time.
What did Babylonians have to do with the 60-second minute?
Babylonian astronomers used a sexagesimal (base-60) number system because 60 is divisible by 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30 — making fractions exceptionally convenient without remainders. They divided the sky into 360 degrees (6 × 60) and the day into 24 hours. Greek astronomers adopted and transmitted this system; medieval Islamic scholars refined it; and Europe inherited the 60-minute hour and 60-second minute through Latin translation of Arabic astronomical texts.