Why do we need units?

Why do we need units?

Standard units of measurement are essential So that everyone can agree on what time it is, how big andसheavy something is, and what the temperature is, So that parts of machines made in different places fit together. Some of the units we use are thousands of years old, while others were invented more recently.

FAST FACTS : the metre

01: The metre was invented in France.

02: There, it became the standard unit of length in 1791.

03: It was defined as one ten-millionth of the distance between the North Pole and the equator.

04: Today, the metre is defined as the distance light travels in a vacuum in 1/299,792,458 of a second.

05: Standard metres, yards, pounds, and so on were made in metal.

06: Each country kept its OWN set of standards.

07: The standard metre was a metal bar with a metre marked on it. All metre rulers were copied from this standard metre.

How is temperature Measured?

》Three temperature Scales are commonly used for measuring temperature – Fahrenheit, Celsius, and Kelvin. The Kelvin scalenbegins at absolute temperature, so it is mainly used by scientists.

》zero, the coldest possiblenCelsius and Fahrenheit are used for everyday temperature measurement.

》Celsius is more common in countries  that use metric units.

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