The definition of the meter has changed over time to become more accurate and precise.The meter was first defined in 1791 as 1/10,000,000 of the distance from the equator to the North Pole.

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We are using it all of the time without even realizing it.

Every time we wash our hands in the kitchen or the bathroom we are using chemistry as the bacteria on our hands is being destroyed and chemicals are working together within the product to ensure that this happens.

By 1960, some distances could be measured more precisely by comparing them to wavelengths of light.

The meter was redefined as 1,650,763.73 wavelengths of orange light emitted by krypton atoms.

In physics, there are seven fundamental physical quantities that are measured in base or physical fundamental units: length, mass, time, electric current temperature, amount of substance, and luminous intensity.

Units for other physical quantities (such as force, speed, and electric charge) described by mathematically combining these seven base units.

All other units are made by mathematically combining the fundamental units.

These are called The SI unit for length is the meter (m).

Venn diagram of science: Top line: Physics Middle row: Biophysics, Science, Physical chemistry Bottom Row: Biology, Biochemistry, Chemistry by Wikipedia.

Physicists, like other scientists, make observations and ask basic questions. For example, the length of a race, which is a physical quantity, can be expressed in meters (for sprinters) or kilometers (for long distance runners).

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