Check out these:
- 1 second is 1 second
- 1 million seconds is 12 days (Interesting)
- 1 billion seconds is 30 years (Wow, that’s a lot)
- 1 trillion seconds is 30,000 years (Jumpin’ Jillikers!)
And for distance:
- 1 millimiter is 1 mm (pretty tiny)
- 1 million mm is a kilometer (down the street)
- 1 billion mm is a 1000 km (600 miles — partway across the country)
- 1 trillion mm is 1,000,000 km (Going around the world 25 times, almost as wide as the Sun)
These numbers come in handy in many applications:
- 99.999% reliability (”Five 9’s”) means an error rate of 10 out of a million. That is, you can be offline for only 10 seconds every 12 days. Or, you can have a tolerance of 10mm for every kilometer. That’s pretty accurate!
- “One part per million” is often used by chemists to measure concentrations of substances. One ppm is like having a presence of 1 second in 12 days. And a part per trillion? You got it: 1 second every 30,000 years. That’s tiny.
Source: Mental Math Shortcuts
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