# What does atomic mean on a clock?

## What does atomic mean on a clock?

Atomic clocks are designed to measure the precise length of a second, the base unit of modern timekeeping. The International System of Units (SI) defines the second as the time it takes a caesium-133 atom in a precisely defined state to oscillate exactly: 9 billion, 192 million, 631 thousand, 770 times.

## What is the smallest atomic clock in the world?

CSAC
The CSAC, the world’s smallest atomic clock, is 4 x 3.5 x 1 cm (1.5 x 1.4 x 0.4 inches) in size, weighs 35 grams, consumes only 115 mW of power, and can keep time to within 100 microseconds per day after several years of operation.

Do you have to set an atomic clock?

All that you have to do is set the time zone, and the clock can display a very accurate time. The only thing more accurate that you can carry around easily is a GPS receiver, which derives atomic clock accuracy in real time from the atomic clocks in orbiting GPS satellites.

Can I buy a atomic clock?

If you have a spare \$1500 burning a hole in your pocket, perhaps you’d like to spend it on an ultra-precise, ultra-small atomic clock, now available for purchase from Symmetricom Inc. Draper Laboratory and Sandia National Laboratories.

### What is the difference between an atomic clock and an ordinary clock?

The difference is that an ordinary quartz clock relies purely on the oscillations of its quartz crystal to count seconds. By contrast, an atomic clock has an extra mechanism—pulsating atoms—that it uses to keep an ordinary quartz clock to time.

### What does the atomic clock tell us about time?

It tells us at which speed our clocks should tick. The Cesium-133 atom defines time. Two components are used to determine Coordinated Universal Time (UTC): International Atomic Time (TAI) is a time scale that uses the combined output of some 400 highly precise atomic clocks.

What is the Deep Space atomic clock (DSAC)?

In April 2015, NASA announced that it planned to deploy a Deep Space Atomic Clock (DSAC), a miniaturized, ultra-precise mercury-ion atomic clock, into outer space. NASA said that the DSAC would be much more stable than other navigational clocks. This section needs additional citations for verification.

What is the calibration of the standard atomic clock?

Calibration of the caesium standard atomic clock was carried out by the use of the astronomical time scale ephemeris time (ET). In 1967, this led the scientific community to redefine the second in terms of a specific atomic frequency. Equality of the ET second with the (atomic clock) SI second has been verified to within 1 part in 10 10.

## What is the best atomic clock to buy?

Best Sellers in Atomic Clocks #1. La Crosse Technology WT-3143A-INT 14-Inch Atomic Wall Clock, Black #2. AcuRite 75077A3M Wireless Weather Station with Large Display, Wireless Temperature Sensor and Atomic Clock #3. La Crosse Technology WS-8117U-IT-AL Atomic Wall Clock with Indoor/Outdoor Temperature #4.