Difference between units and international units?

Answer 1

SI has a set of base units, which are all from the metric system but are chosen to give consistency:

Length in meters, mass in kilograms, time in seconds, temperature in degrees kelvin, electric current in amperes, amount of substance in moles, luminous intensity in candelas.

Previously, scientists used to use the CGS system, which stands for centimeter gram second, and engineers used to use MKS which stands for meter kilogram second, largely because engineers were used to larger quantities. Now it is more unified. Scientists used to use as force the dyne, now we use the Newton, and for work the erg, now we use the joule. For speed we use meters/sec instead of centimeters/sec. For pressure the SI unit is the pascal which is 1 Newton /sq meter, whereas scientists used to use dynes/sq cm, and engineers often used kg/sq cm.

All these SI units can be called metric, and they are all related to the earlier metric system, but using consistent units makes it easier to compare work done in different countries and disciplines.

Answer 2

scientists use SI units so they can make sure they don't have any misunderstanding like say one person said they had the biggest fish ever it was 70cm long then the other person said the probably caught a bigger one it was 3 feet long they would probably wonder who's was bigger and so scientists said they should just make all there experiments with the same units of measure and that's where SI units came up

Answer 3

Nothing. The SI is the current metric system.

Answer

The 'metric' system is a generic name for a number of different systems based upon multiples of 10. The current, rationalised, metric system is called SI. Previous versions included the mksA (metre, kilogram, second, ampere) system and the cgsA (centimetre, gram, second, ampere) system.

Answer 4

International units are the Standardized units used in Scientific literature across the world. They are different than the US Units.

(For Example; The US unit for length is Mile/Feet/Inches; Whereas the International Units are Kilometers/Meters/Centimeters)

Similar differences are present in weight (Pounds vs. Kilograms) and Temperature

(Degrees Fahrenheit vs. Degrees Kelvin)