CBSE Class 6 Answered
why are standard units used in measurements?
Asked by gspublicschool | 06 Oct, 2018, 18:30: PM
Expert Answer
SI units stands for units of International system. Every measure of SI units is commonly recognised anywhere around the world.
For example 1 kg of mass is same everywhere. National standard of mass in every and each of the countries has been
calculated to the international standard. Similarly all other measures used everywhere is calibrated to international standard.
Hence value of each measure is understood world-wide. Otherwise pint used in British is different from the American's pint.
Another advantage is its multiples and sub-multiples are consistent and are powers of 10.
10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km etc
whereas the conversions for inches, feet, yards, furlongs, miles are as follows
1 feet = 12 inches, 1 yard = 3 feet, 1 furlong = 220 yards, 8 furlong = 1 mile.
Another advantage is that when used in engineering calculations to calculate the derived quantities,
the constants of base units to be used are usually unit.
For example 1 watt is the power needed to move 1 kg mass to a distance of 1 m with speed 1 m/s in 1 s duration.
But 1 Horse-power used in british system is the power needed to raise 550 pounds against gravity with speed 1foot/second.
Answered by Thiyagarajan K | 07 Oct, 2018, 01:08: AM
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