September 14, 2021

EDU HYME

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List of International and S.I. Equivalent Units

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International and SI units Eduhyme

The International System of Units (SI) is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

Also Read: List of Important Scientific Instruments

It comprises a coherent system of units of measurement starting with seven base units as listed below:

INTERNATIONAL UNITS

S.No. Base unit Symbol Year of Adoption
1 METRE – Unit of length m 1960
2 KILOGRAM – Unit of mass kg 1960
3 SECOND – Unit of time s 1967
4 AMPERE – Unit of electric current A 1948
5 KELVIN – Unit of thermodynamic temperature K 1967
6 CANDELA – Unit of luminous intensity cd 1967
7 MOLE – Amount of substance* mol 1971
  • *One mole (mol) is an amount substance in grams equal to its molecular weight.
  • *In 1971 the US decided to change over to the Metric System in ten years at the end of which the US will be predominantly but not exclusively on the Metric System. The Metric Conversion Act of 1975 legalized the change-over and set up the US Metric Board to supervise it.

S.I. EQUIVALENTS

The SI is intended to be an evolving system; units and prefixes are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves.

LENGTH
1 1 angstrom = 0.1 nanometre (mm)
2 1 chain = 20.12 metre (m)
3 1 engineer’s chain = 30.48 metre (m)
4 1 fathom = 1.829 metre (m)
5 1 foot = 0.3048+ metre (m)
6 1 furlong = 0.2012+ Kilometre (km)
7 1 inch = 25.4 milimetre (mm)
8 1 link = 0.2012+ metre(m)
9 1 mile = 1.609 Kilometre (km)
10 1 nautical mile international = 1.852 Kilometre (km)
11 1 nautical mile telegraph = 1.855 Kilometre (km)
12 1 nautical mile U.K. = 1.853 Kilometre (km)
AREA
13 1 acre = 4047 sq metre
14 1 sq foot = 929.0 sq centimetre
15 1 sq mile = 2.599 sq kilometre
16 1 sq yard = 0.8361+ sq metre
VOLUME
17 1 cubic foot = 28.32 cubic decimetre
18 1 cubic inch = 16.39 cubic centimetre
19 1 fluid ounce = 28.41 cubic centimetre
20 1 gallon, imperial = 4.546 cubic decimetre
21 1 gallon US = 3.785 cubic decimetre
22 1 pint, imperial = 0.5863+ cubic decimetre
MASS
23 1 grain = 64.80 miligram
24 1 hundred weight = 50.80 kilogram
25 1 maund = 37.32 kilogram
26 1 ounce = 28.35 gram
27 1 pound = 0.4536+ kilogram
28 1 quintal = 100 kilogram
29 1 seer = 0.9331+ kilogram
30 1 tola = 11.66 gram
31 1 ton = 1.016 tonne
32 1 ton US = 0.9072+ tonne
VELOCITY
33 1 foot per minute = 0.00508+ metre per second
34 1 foot per second = 0.3048+ metre per second
35 1 inch per second = 25.4 milimetre per second
36 1 knot = 0.5144+ metre per second
37 1 knot UK = 0.5147+ metre per second & 1.853 km per hour
38 1 mile per hour = 0.4470+ metre per second & 1.609 km per hour
FUEL CONSUMPTION
39 1 gallon per mile = 2.825 litre per km
40 1 US gallon per mile = 2.352 litre per km
41 1 mile per gallon = 0.3540+ km per litre
42 1 mile per US gallon = 0.4251+ km per litre

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