Where does this come from, and can I check it?

The agreed value describes free fall at sea level and 45 degrees latitude. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a science fact?

Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Standard gravity is fixed at 9.80665

The agreed value describes free fall at sea level and 45 degrees latitude Gravity varies slightly with latitude and altitude, so metrology adopted a conventional standard acceleration. It is defined as exactly 9.80665 metres per second squared. Scales that report mass from weight use this figure, which is why they read slightly differently on a mountain. It sits in Mondo's science collection, one of 200 facts that each trace back to the reference below.

Where this comes from

NIST

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Science trivia

More facts like this

Minus forty is the same in both scalesThe Celsius and Fahrenheit scales meet at exactly minus 40 degrees The SI rests on seven base unitsMetre, kilogram, second, ampere, kelvin, mole and candela anchor every measure SI prefixes scale measurements by powers of tenKilo multiplies by a thousand and milli divides by the same amount Clocks run slower in stronger gravitational fieldsGeneral relativity proves that gravity curves spacetime and slows down the passage of time The Beaufort scale describes wind by its effectsTwelve steps run from calm air to a hurricane, once judged by the canvas a ship carried Lavoisier showed that mass is conservedWeighing sealed reactions proved that nothing vanishes in combustion

Tags: measurement, gravity, units

Standard gravity is fixed at 9.80665: the short answers

Where does this come from, and can I check it?: The agreed value describes free fall at sea level and 45 degrees latitude. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.